Why Does It Say Missing of Fonts Opening PSD, AI, PDF, CDR files?

Because you do not install the font, so it remind you of missing fonts.

A. Some times, the file translate the English name of the font into Chinese, such as "AvantGarde Bk BT Medium" into "AvantGarde BK BT-普通". You just need to search the English name.

B. For Adobe software, such as Adobe Photoshop, Adobe Illustrator, Adobe InDesign, Adobe Acrobat, the name shows as PostScript name instead of the real name of the font. You just have to search the PostScript name

C. Some fonts shows different names in maxOS and Windows which causing missing of fonts when you using the other OS to edit the file made in one OS. Such as the name in Windows shows "Proxima Nova Lt Regular" and shows "Proxima Nova Light" in macOS.

Tip: For Adobe software, it shows "Font Family + Style" in the font list but it says PostScript name in the reminder.