Migrate Libraries using ShareGate's Copy Site Object misses DispForm.aspx for the library

Mia Lohé Chung Thanks for your solution because we had the same problem for duplicating our CRM community.the other unsolve problem is that after duplicating the drop-down menu doesn't migrate. any solution?  

Thanks for the information. In my case I had already deleted the source and the forms weren't that important that I would worry about losing them.

It appears the forms are copied across but the link from the list to the forms is missing. In my case I used designer to browse all files and lists and delete the original forms. I then used Designer to re-create the forms.

If you didn't want to delete the migrated forms, you could just recreate with a different name, using Designer.

Mia,

If I understand your process you would have to run this script on every single site?

Thanks Mia, I've tried it and it worked perfectly! It's so annoying with SharePoint Online that enabling script in the admin console is not enough. You had to use Powershell too. It worked. The migrated libraries now have the missing forms. It also solved another issue with the OneDrive iOS app. It can now see the migrated library. Before this, the OneDrive iOS app could not see the migrated libraries. I assume that's because of the missing forms. Thanks again.