I am using the current version 1.8.5 (187) with sync via iCloud. The sync works and is not the problem. Regardless of whether I add a pdf document via the desktop version or mobile version, it is not displayed. On mobile, only an empty field is displayed with 0 of 0 pages. The same note with pdf can be displayed on the desktop version even if I have added the pdf via mobile. Images, for example, work as attachments in a note on mobile. There are no problems with this.