I created a QGIS project with four geopackage layers for an uni project. I made sure to include all four geopackage layers in the same folder as the QGIS project and then zipped it to send it to my friends. But once they try to open it QGIS shows a chart with my four layers and asks if they want to keep these unavailable layers.
I recreated the layers, checked the path etc. it just won't work.
I'm new to QGIS.