The thumbnail settings are specified in the specific Pages DB Options, however doing a POST with the image included seems to generate a 500x500 thumbnail regardless of the settings.  If you go into the record after it's been created by editing it on the record view page, then save it, it will regenerate the image to the correct size.  Obviously this is a bit too much effort if you have many records.  Is there any other solution?  There used to be a rebuild thumbnails, but I think that was removed quite some time ago.

Any ideas on this one?  Every API record created I have to manually go and edit it and re-save to get the thumbnail sized correctly.

Thank you for bringing this issue to our attention! I can confirm this should be further reviewed and I have logged an internal bug report for our development team to investigate and address as necessary, in a future maintenance release.

This has now been resolved in the 4.7.16 release. Please update if you are seeing this issue. If you are then still seeing the issue, please let us know.