Hello @LiviaCastelli …
Which process are you using the copy an existing module from one course to another course?
Assuming that you are enrolled in both courses, you should be able to copy and/or import an entire module from one course to another.
If you are following the directions in either of these Guides, and the module is still not copying correctly, you may need to contact Canvas Support. How do I get help with Canvas as an instructor?
Keep us posted on the status, and let us know if we can be of further help…thanks!