Receive 'handle bad layers' and 'invalid data source' message when importing project from QField back to QGIS

Question

using QGIS 3.14.1 and Qfield 1.5.3 with a Samsung Galaxy TAB A (2016)

I have created a Project in QGIS for use in Qfield. I am able to open the project in QField on the tablet and edit the layers with no problem. However when I import the project back to the laptop and open in QGIS I get a message to handle bad layers for any layers I have edited (the rest are fine) and then when I navigate to the source of the layer I get an 'invalid data source' error and the layer won't open.

This happens whether I use Qfield sync to package the project or not.

File paths are set to relative.

I have tried using QGS rather than QGZ - same outcome.

I have made sure versions of QGIS and Qfield are up to date.

Answer 1

Solved it in case any one has the same struggle, all the layers need to be GPKG instead of SHP.