File channel view:: Button with "Attach" confuses user

[shepilov]

• I've selected multiple images in the first tab
• Then moved to the "Files" tab
• Tap on file
• Only one file, I tapped, was send but not the previous selected images

But the button on the screen with the "Прикрепить" is still on my screen and it confuses user
My expectation was that I need to select more file
Remove this button on the "Files" tab, please