»Hello Michael,
Thank you for contacting us.
Usually as a workaround there is an option to set up a WebDav connection to unsupported cloud storages, but seeing that Tresorit doesn't even support WebDav, unfortunately there is no way to connect to it. I have added Tresorit support to our app wish list so that our developers consider adding this feature while working on the future updates and will follow you up as soon as it is implemented.
Please let me know if there's anything else I can assist you with.
Best Regards,
Ilona Demkowska
Readdle team«