When selecting a file to attach from your phone, it is hard to attach to a group.
Example, if I find a pic I want to share and select Textra to send to, it doesn't take me my conversations, instead it takes me to the option to start a whole new message which means I'd have to type in all members of the group.
This is the same process when forwarding a message as well.
Please make an option to select the conversation you want to send the file to versus manually entering in each person.