Is it ture that annotations are limited to png export? are there any plans for pdf?

Is it ture that annotations are limited to png export? are there any plans for pdf?

I think that this has already been discussed in this forum.
Right now it’s just PNG, however many users are asking for alternative output formats, eg. vectorial formats (SVG).

I think it’s important to distinguish between annotations to a PDF document and notes taken in the note app.

Annotations made to PDF files can be easily exported as PDFs and viewed on other devices. Check out posts #9 and #11 by gimble on the following thread. In post #11, gimble has uploaded two PDF files: one shows the document before annotations, the other shows it after it has been annotated with highlights, scribbles and side notes:

https://www.mobileread.com/forums/showthread.php?t=296167

Notes made in the note app can only be exported as PNG files at the moment. Hopefully, that will change.