Failed to send image on Android Tablets

I installed Teams on my daughter's Android Tablet (Tab A, SM-T585). Everything seems to work fine until I try to reply to a post and attache a picture (either taken directly from Camera or from Gallery). It says 'Sending...' and it keeps doing that for about 5 minutes (see attachment 1.jpg). Later it shows a message says 'Failed to send message' (See attachment 2.jpg). I tried to send couple of times but it doesn't work (See attachment 3.jpg. 

Note that when I post regular text it works. I tried sending voice note and it doesn't attache. All attachment types fail to post. 

Tablet I'm using is brand new. I retested settings and installed only Teams and still didn't work. I tried installing it on Samsung Tab E (T561) but also didn't work. 

I, however, installed Teams on my Samsung Note 8 and sending attachments worked fine. Also, from the web I was able to post and attache files. 

Looks it is a device type specific issue - only on Tablets it doesn't work.

Anybody had this issue earlier and any suggestions of how to fix it?

Appreciate any help.