Transfer data from old survey to new survey breaks relationship class

JamesWilson2

I am trying to transfer data from an old survey to a new survey, as we have added fields and the schema no longer matches.

I have attempted to download the FGDB and update the new hosted layer, but the attachments do not transfer.

I have attempted to use the Append tool in Pro on the hosted feature classes, and on downloaded FGDB version of the feature classes. I can get the data (with attachments) to append to the header table and to the repeat, but I cannot get it to maintain the GlobalID - so the relationship class between the header table and the repeat breaks.

Any idea how to transfer data between my surveys?

Data structure looks like this:

Question on behalf of Peter Naske‌

JamesWilson2

Current workaround:

The 'update' (download file geodatabase from previous survey, and upload to new survey) fills the header and related table, retains the GlobalIDs and the relationship class, but loses attachments. After doing this step, I open both feature services in Pro, delete the data from the related table in the new survey, then append the data from the old survey, which maintains attachments. It is clunky, but it works for now (I cant see it working once nested repeats are brought in, or if there were attachments against both the header and related data).