This warning began appearing in all my existing projects about two weeks ago.
However, I intentionally include some read-only layers in my QField projects. Field staff need to be able to view these layers, but they do not need to edit them in the field.
@gm00039 , you can mark the layers as read-only in QGIS through the project configuration dialog’s datasets panel. That will take care of the warning.
We have a similar but more serious problem with virtual layers - QFieldCloud can’t synchronize virtual layers so there should be some way of asking QFieldCloud to ignore virtual layers during synchronization but we haven’t been able to find anything.