We have several non-custom fields in Square which do not show up in Skyvia. For example, we have a FirstVisit, LastVisit, and TotalSpent. Skyvia does not see these fields at all.
Thank you for your reply.
We have checked Package ID 11817 and as we see it is related to Import from SQL Server to Salesforce. It seems that it is not the Package you are talking about.
You can open your Package and see its number in the address bar. Please check the example from another Package in the attached screenshot.
We are looking forward to hearing from you.