I can't export any pdf to Gmail on Dropbox ios. Both apps are latest versions as of 11/03/21. The Gmail option is not I'm the list of share options. When using the iOS Mail app, it switches to Gmail (my default mail choice) but the link is garbled and it doesn't export/attach the PDF.
This is only an issue with pdfs. All other file types show the Gmail option when exporting/sharing and work as normal.