We restrict uploads to 40 photos at a time in order to optimize upload speed and performance. A higher limit (up to 200 photos at a time) is available for PhotoCircle+ and premium plan subscribers:
Upgrade to an Education & Nonprofit Premium Plan
Upgrade to a Teams & Business Premium Plan
Upgrade to a Professionals & Consultants Premium Plan
In general, we recommend that you curate uploads to Circles to the best photos rather than uploading everything.