Hi @aryanli, did you make sure that everything was synced in v0.31.8? Since the export is done locally, the objects have to fully sync first. Try going back to v0.31.8 and waiting a while for all of your objects to sync from the old Anytype node before exporting.
One situation we have encountered is that we export Protobuf with just the text data, getting a zip that does not contain things like images, pdfs and other files.