Steps to reproduce:

1. Login as admin.
2. Create a course and enrol student s1.
3. Allow the following permissions to student role:
   • atto/h5p:addembed
   • moodle/h5p:deploy
4. Create an assignment and enable "Online tex" in the submission type.
5. Login as student s1.
6. Access to the assignment.
7. Click the "Add submission" button.
8. Embed an H5P content using the H5P Atto button. You can upload any H5P file.
9. Save changes.

Expected behaviour:

The H5P content is displayed.

Current behaviour:

The "H5P file not found" error is displayed.