Sadly the Android's react version seems to lack any share features - the app doesn't appear in any 'share to' dialogues, nor can I share pictures or such from the app itself (For example using rocket.chat I can long press on an image and I will be able to share the picture to other apps). The issue appears to only have around 100 combined votes on uservoice (https://mattermost.uservoice.com/forums/306457-general/sugge... + https://mattermost.uservoice.com/forums/306457-general/sugge...) so I'm not holding my breath for this to be implemented anytime soon, but it would be a really useful feature to have for when you need to move graphical assets around and you want to take a quick look on your phone for example.