The issue you're experiencing with the PDF file appearing in Chinese after downloading may be related to the font used in the document. Some fonts may not be supported by the PDF viewer, leading to unreadable characters. For instance, Adobe has been known to have issues with certain fonts, which can result in such problems.
To edit the PDF, you will need a dedicated PDF editing application. Here are a few options you can consider:
- Adobe Acrobat Reader: Good for viewing and basic edits.
- Adobe Acrobat Pro: Offers advanced editing capabilities.
- Other PDF editors: Such as Foxit PhantomPDF or Nitro PDF.
Regarding the inability to edit the PDF directly from your email, most email clients only allow you to view PDFs without editing them. To make edits, you should download the file and open it in a PDF editor. If the problem continues, it may be beneficial to reach out to Adobe Support for tailored assistance based on your specific software and issues with the PDF.