Answer 1

There is an official GitHub app for android, but it's more oriented towards issue management and code review, it is not able to checkout and push source code from your device.

I think your best option is to try one of the solutions mentioned in this SO post:
https://stackoverflow.com/questions/2701078/how-to-use-git-on-android

Answer 2

Khulyso Dev®
It would be helpful to have more info as to what you tried and in which way it failed.

Android phone as well.

One issue I've had is that Sololearn doesn't save the files on your device, they appear to only be on their server.

I have installed a few editors and compilers. I've found this one works quite well:
https://play.google.com/store/apps/details?id=app.compiler

It supports many programming languages.

I open the code in Sololearn (Code Bits, My Code Bits), select all and copy. Then open the compiler and paste it in and save that. The file is now on my mobile device in a visible folder called "Compiler", usually in one of the sub-folders for example "cpp17".

I go to my github repository in Chrome (does not need to be in desktop mode), click on the three horizontal dots to the right of the branch ... select Upload Files. When the dialog opens, browse to the Compiler folder (or wherever you have the file(s)), whatever sub-folder the file is in, select the file(s) and upload, Commit.

Answer 3

Go to GitHub's website, turn on the desktop site, and then add files from your mobile as you add from your computer.