Im the admin and I have a Collaborator. We CANT work on same app. and I just bought my first subscription to a pro app

Hello
Can someone help on this:

I’m the admin and I have a one

Collaborator. We CANT work on same app. and I just bought my first subscription to a pro app.

Is this normal? two people are not allowed to work on same app?

Thanks in advance

Yes, that has always been the case. Only one at a time.

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