I have no problems applying a custom resource pack through the realms tab but I am unable to add a behavior pack. This pack does NOT use experimental features and shows up fine on local worlds. I have made sure the UUIDs are unique and even attempted to change them and update the version number. When I go to apply it on realms, it does not appear as an available pack how the resource pack does. Even downloading the realm, adding it, and attempting to reupload it does not work.

NO experimental features are being used

EDIT: In screenshot you can see where I am also attempting to apply it directly to the realm, however I am given "No resource packs" in the behavior pack section.