In the app there is a button to send the diagnostics log to developer. However, our Mergin Maps server is hosted by Septima here in Denmark. It would therefore be smart, if our logs were sent to them as most issues are likely to be due to the QGIS and data setup. If there is a technical issue with the app, they can raise the issue with you.

As it is now, our only way for us to share the log with Septima is thru screen shots. As the log can be quite extensive this is not optimal.