Restrict replacing Attachements

[shebinkhfinance]

How can i restrict replacing attachments in a card

[Alisson Sartor]

Hello, welcome to the community

Currently, the only way of a user not being able to change the attachments is that if he is a observer on a board. 

Workspaces that subscribe to Trello Premium can add "Observers" to boards within their Workspace. 

Observers are board members that are able to view a board and the cards within the board, download card attachments, comment and vote on cards (if that is enabled for the board), and export the board. 

Observers are not able to move or edit cards, upload card attachments, tick the box on a checklist item, and observers can't change board settings.

https://support.atlassian.com/trello/docs/adding-observers-to-boards/

Kind Regards
Alisson
Trello Team