Can't transfer files to tablet from phone - Android Q&A, Help & Troubleshooting

So, I can't send or receive files on my Android tablet by wifi, no matter what app I use(tried es explorer, mi drop, shareit, just in case but no luck) that starts a hotspot and I connect from my phone but instantly says disconnected and fails. My phone transfer files normally with other devices and my tablet cannot transfer with any. But my tablet can receive and send through Bluetooth but is not convenient as it is very slow compared to wifi for bigger sizes files. My Android tablet is Google Nexus 7 2013 Wifi (flo) by Asus and has an unlocked bootloader and runs on custom rom Lineageos 14.1-20180712-NIGHTLY-flo (the most recent) and Android 7.1.2 and kernel version 3.4.0-lineageos-g90f7354. I'm not sure but it's possible it appeared after installing LineageOS. And in the older versions of LineageOS it was occuring. Also my phone is Mi Max 2 running on Android 7.1.1 NMF26F and on MIUI 10 Global 8.7.12 Beta(newest) but shouldn't matter as it can transfer files via WiFi normally with other Android devices. I do not know what's causing this but it is inconvenient for me so if anyone could help me solve this I would really appreciate it.

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[Q] Cannot seem to access android devices on this pc

I have 5 devices here, Asus MeMo Pad ME170c, Lenovo 3500-fl, Archos Gamepad, HTC Desire HD and a cheapo generic chinese AllWinner a13. I cannot seem to get any of them to work on this pc. I cannot access them via adb nor browse the files on them via windows. Both the Asus and Lenovo are running KitKat 4.4.2 and connect up and under adb show as unauthorized, but I never get the authorization prompt on the devices. They show up under My PC where upon trying to access internal storage the window locks up/stops responding and the progress bar at the top fills up and gradually gets slower and slower until it's almost finished but then just carries on forever. I can never access the files. On my other pc I can access the files and get the authorization promp. Both pcs are running the exact same copy of windows 8.1 (installed from the same disk), are up to date and are both running the same usb drivers. So why can't I access the devices from this (my main) pc. The other devices are running older versions of android so I don't need to authorize the computer on these. They periodically show up as 'device' under adb but i cannot access their files as they show up as a removable device and when trying to access them windows says 'no media in the drive'.
I've done everything the same on both machines, the only difference is their hardware so I am wondering if there is anything hardware related that could be causing this problem. Could it be something to do with the motherboard?
The pc I can't access the devices with has an Asrock Z77 Pro4-M motherboard.
Does anyone have any suggestions on what could be going wrong here?
Cheers
Fraz.
I've been trying to sort this out on and off for months now and had no success. It's such a hassle having to upload and email myself the apk every time I need to test something. Any suggestions?

[Android 5.0.2] Multiuser issue and mobile not being detected on W10&7

Hello, just bought a mobile with android 5.0.2 which as of several android articles it should have multi-user option (ZTE Blade S6 Ultra a.k.a. Vodafone Smart Ultra 6), it didn't had the ability to enable multiuser but I could fix it editing the build.prop file.
However, now I'm facing a very unexpected and big issue with this mobile...
When I create a new user account and install one game which was previously installed on another use, the game of that new user is using the EXACT gamedata!! This is supposed that shouldn't happen!!
Time ago I was using the multiaccount feature on a tablet on android 4.3, and I could create multiple users and each user had its own data. Why is Android 5.0.2 using the exact data on ALL users, even in Guest!? Also, it doesn't let me to create Restricted profiles!!!
Another issue is that my PC doesn't detect the phone, I've installed already the ADB drivers for that phone, but the PC still doesn't detect my device!!! I've tried it already on Windows 10, Windows 7 and even Windows XP on three different PCs, and none detects this phone!!!
Please help me, I've looked already on Google how to solve these issues and I found nothing related with my issues, for the PC issue I've tried everything and solved nothing.

Gapps TVstock installation on Android TV 7.1, how to do it?

hi, i trying to use the TVstock Gapps package on geek till it hertz's Android TV 7.1 Nougat for PC (build on Android x86)
i am unsure on how to proceed with the installation of the package
my hope is that others who want to make their own Android TV with Gapps will find this post useful and might make videos or more in depth tutorials on the subject
but at this current point, i don't know how to proceed
but this is a summery of what i currently have to work with
1. Android TV 7.1 running on VMWare Workstation 14 player NON ROOTED (couldn't get it working on actual hardware will solve that later, but as far as i know this shouldn't be different on actual hardware then on a virtual machine)
2. a USB (for transferring files and apks, there is no drivers for android to allow file copying, it also has no Ethernet capability so i have to use a USB wireless device to allow for a network connection)
i have tried rooting this device with various root methods, with no success, the opereating system seems to dismiss it, when i tried a terminal method, apps couldn't still see that i had rooted the device even when i remounted the system partition so i could write it to it, apps still couldn't see that the device was rooted
i want to try and get this done without rooting but i am happy to try again with other suggested rooting methods
thanks for reading and i hope you can help me and others with the same problem

issue with android 12 in large files

hi
Today I fully installed Android 12 via Odin
But I noticed that I cannot transfer large files larger than 4 GB to the phone
Either via mtp or even after rooting via recovery
Any suggestion to solve this problem?

[IMPOSSIBLE] Root android 7.1.1

Good afternoon,
I bought my car with a Chinese screen installed "px3" with android 7.1.1 but it has a problem and that is that the bluetooth module does not work, it does not detect or connect to devices, in fact it does not even appear in the configuration menu.
I have been able to investigate something and I have found that this tablet has not been assigned a MAC address to bluetooth, it appears as "not available".
I have also not found software to update the tablet and try to automatically take a MAC address, on the other hand I have tried to root without success in different ways such as installing .apk applications to root the tablet and being android 7.1.1 it is incredible that none like kingroot, vmos , kingoroot, etc. don't work.
The reason for wanting to root the tablet is with a root browser, go to the bluetooth MAC configuration file and write some MAC address to see if that is really the error for which bluetooth does not work for me on the tablet.
I've thought about connecting via adb but I'm really not sure what process for this android I can follow to actually root successfully.
In case it helps you, I can connect via USB and also via SD slot.
Here are some pictures of the data I was able to get from the device, I hope someone can help me because this problem is driving me crazy...
Update:
Good afternoon,
px3 RK3066 with android 7.1.1 (i dont found any firmware)

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