Never been able to synchronize

[Ipickedausername]

Hello,

Since I'm using QField, I've never been able to synchronize, using QfieldSync.
Instead, I'm using the graphic modeler and have to copy-paste data sometimes.

I'm following the instructions from here: https://docs.qfield.org/get-started/tutorials/get-started-qfs/

All my attempts to synchronize never gone well.
The project is properly packed (in a folder on the desktop, otherwise the layers are not working), and the data can be collected on field without any issue.

But, the data synchronization will result in zero changes on the QGIS project. If I try to synchronize again, then I a message informs me that data from this file are already synchronized with the project.

What am I doing wrong ?

Thank you.