I have a custom object bicycle with a form view, where I can see the usual attribute, including attachments to the objects.

I link to this object from an project.issue object with a many2many relation and added the field to the project issue form view.

Now I get a small table with the related bicycle objects, but there are no direct links to the "main" form mentioned above, e.g. where I can see attachments. Such links exist for other elements, that are not many2many e.g. to the partner.

Do I have to use a special widget? Do I have to add some special context?