The short answer
No. Your data. Shrink it from its app; don’t delete the folder.
What is it?
Photos, videos, voice notes and files from your Signal Desktop chats, stored encrypted in ~/Library/Application Support/Signal/attachments.noindex. It grows with every media-heavy chat.
Photos, videos and files from your Signal chats. Delete them from conversations in Signal; never deleted by MoreRoom.
What happens if you delete it?
Nothing comes back: Signal does not keep copies on its servers, and messages that point to a missing file show it as unavailable.
How to remove it properly
Delete media from within Signal: open a conversation, view all its media, select large items and delete them. Disappearing messages keep busy chats from piling up again.
From the app itself: Signal: open a conversation > All media, then delete large items.
Before you delete it
Removing files by hand breaks Signal’s references to them; always delete from the app.
How MoreRoom helps
MoreRoom recognises this as your data and never suggests deleting it. It shows how much space it takes, so you can shrink it from its own app.
Frequently asked questions
Can I delete Signal’s attachments.noindex folder?
No. Your data. Shrink it from its app; don’t delete the folder. Nothing comes back: Signal does not keep copies on its servers, and messages that point to a missing file show it as unavailable.
Will Signal attachments come back after I delete it?
No. Nothing comes back: Signal does not keep copies on its servers, and messages that point to a missing file show it as unavailable.
How do I remove Signal attachments properly?
Delete media from within Signal: open a conversation, view all its media, select large items and delete them. Disappearing messages keep busy chats from piling up again.