Deleting User - Do files remain?

Hi, deleting a user from IAM will not undo or delete the user's past actions. You do not have to worry about previously uploaded files being deleted.

From AWS documentation, deleting a user removes

• The user
• Any user group memberships—that is, the user is removed from any IAM user groups that the user was a member of
• Any password associated with the user
• Any access keys belonging to the user
• All inline policies embedded in the user (policies that are applied to a user via user group permissions are not affected)
• Any associated MFA device

Documentation for reference: https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_manage.html#id_users_deleting

Hope it helps clarify your question :)