Create a file system repository (See this document for details about how to do that - https://docs.moodle.org/34/en/File_system_repository ) Upload some testing files (images, pdf, video). Create a folder, file, or label (picture in the editor) resource . Add these files to a course. Add them both as a copy and as an alias. Add a file via the server files repository. You will have to find a file that you have used before that is an alias, you can tell by the blue arror in the bottom left corner. Choose a file that is from the file system repository originally. Remove the repository (without copying over the files). Go to "Site administration > Plugins > Repositories" And change the Active status to Disabled. Enter the course and visit all the locations that you used the repository to insert files. The files that were an alias should now be removed and there should be no error about an invalid repository id. Follow the above process with the Server files repository, and Private files (in step 4 use the file system repository instead of the server files repository). Check that there is no error about an invalid repository id.