and then choosing "Export as PDF" can sometimes re-embed or fix font encoding issues. Search for CJK Fonts:
This often "bakes" the font into the document so it can be viewed anywhere. Cidfont-f4 Font Free Download
Because this font file only exists inside that specific PDF, there is no master version of "Cidfont-f4" on font websites like Font Squirrel or Google Fonts for you to install. How to Fix "Missing CIDFont-F4" Errors and then choosing "Export as PDF" can sometimes