Problems after integrating seafile Pro 7.1.13 with Collabora Online

Integrate seafile Pro 7.1.13 with Collabora online, open, edit and save the file normally.
But

  1. When you select “Preview and Download” to share a document, the preview of the opened document is converted to a PDF preview, not through Collabora online preview.
  2. When you select “Cloud Edit and Download” to share a document, open the link to the normal Collabora online editing state, and the modification is saved normally.
  3. When the “Preview and Download” folder is in the folder, the open preview of the document in the folder is always in the loading circle state, and the preview is not opened.

I wonder if 1 and 3 are bugs?
When integrating onlyoffice, all the documents above are loaded and previewed or edited normally through onlyoffice