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The latest documentation was moved to docs.qfield.org
TODO check and complete.
To manually synchronise your QGIS project, you will need a portable version of your .qgs file. Portable means that all paths are relative and datasets are reachable from the device.
Check that
is set to “Relative” and that all required data files are in the same folder like the .qgs file or in a subfolder.For increased productivity, we suggest having a look at qfieldcloud and QFieldSync plugin