Unfortunately, there is no native Android App to access SeedDMS. If somebody has some spare time and thinks this has to be changed, then please contact me at firstname.lastname@example.org. I’ll support wherever I can. Well, in the mean time there is another way, which covers at least the basic access on documents stored in SeedDMS. A brand new extension makes SeedDMS behave like a Paperless-ngx server by adding its REST API endpoints.