This scope lets an app "Add, edit, and delete files and file comments"
This feature was exclusive to our workspace apps developer preview. The preview has now ended, but fan-favorite features such as token rotation and the Conversations API will become available to classic Slack apps over the coming months.
files:write only works with workspace apps.
This OAuth permission scope works with these Web API methods.
files.comments.add- Add a comment to an existing file.
files.comments.delete- Deletes an existing comment on a file.
files.comments.edit- Edit an existing file comment.
files.delete- Deletes a file.
files.revokePublicURL- Revokes public/external sharing access for a file
files.sharedPublicURL- Enables a file for public/external sharing.
files.upload- Uploads or creates a file.