Seafile can opening text and PDF files and showing them, also in an encrypted library. But it cannot editing a document with OnlyOffice in an encrypted library. This is only possible in an unencrypted library.
Yes I known all these limitations with encrypted libraries. Especially the one with Seadrive is irritating. Encryption is one of the most useful functions in Seafile. Without the posibility of encryption I would not absolutely choose Seafile.
Sorry to hear. What is it that bugs you? I think Seafile is not too bad a software.
According to Seafile’s roadmap, the developers are working on SeaDrive’s support of encrypted libraries. Just give the developers some time. The Seafile team is currently busy releasing a really nice version 7.