'Upload File Not Available' Errors / Default File Setting for Deployed Models

We have occasionally experienced failures in import actions (on deployed models) called via Anaplan Connect with the error ‘Upload file no longer available’. Our understanding is the default file should to be specified as ‘admin’ instead of ‘private’. This setting can’t be changed via API call, so we updated the mappings in our dev model. When we attempted to sync the updated dev model with an existing QA model, the change in default is not recognized as a structural change.  When we created a new QA model by copying or importing the dev model, the default file setting on our import mappings reverted to ‘private’. And we can’t update the default file in the QA model without taking it out of deployment mode, which would break compatibility between the dev and QA models.

How can we best avoid ‘Upload file no longer available’ errors on models in deployment mode?