Hello 
I`ve got an expierence with theese guys  that were mentioned before. 
https://appyet.com/forum/index.php?threads%2Fhow-to-create-an-android-app-with-appyet-guide-book.1547%2F
https://www.dazhuanlan.com/wandal/topics/2635821
https://comunidad.revistamyt.com/post/maria-melba-calero-maria-melba-calero-carolina-benavides-carolina-benavides--60a83bed7784a24bfbbc221c
https://ideas.gohighlevel.com/mobile-app/p/file-upload-field-should-work-on-mobile-app
https://network-89730.mn.co/posts/19992438
 
And I watned to say thanks!