Android Question Picture for gallery to app

[wl]

Hi,

Probably this question was already asked, but then I probably am not searching well ..

If I open the photo gallery app of my phone, there is an upload button that allows me to upload the selected picture(s) to email, twitter, facebook, ...
How could I add my own application in this list and selected picture(s) "send" to my app ?

Thanks

 

[wl]

ok, should have looked just for jus ta few more minutes: https://www.b4x.com/android/forum/threads/receiving-shared-images-from-other-apps.81041/#content