Deleting attached files in the RingCentral app desktop
and web | RingCentral app

If you have attached a file to a message, one of the actions you can take is to delete that file.

Navigate to Message via the left-hand navigation bar.
Select a conversation from the conversation list.
Locate the file you’d like to delete either via the message thread or conversation details panel at the far right.
Hover your mouse over the file and click the More icon that appears in the bottom right-hand corner of the file.
Select Delete file from the dropdown menu. This will prompt a confirmation message.
Click Delete to complete deleting your file.