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The latest documentation was moved to docs.qfield.org
You will need a portable version of your QGIS project file (.qgs). 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 a subfolder of it.For increased productivity, we suggest having a look at the QFieldSync plugin.