해결됨
이 주제는 답변이 닫혔습니다.
If your file contains items that are not supported in your required format (e.g. layers or 16 bits/channel) then the file format is moved to the Save a Copy command. This was driven by changes in the Mac Operating System, although the changes are applied to both Mac and Windows versions to keep them aligned.
https://helpx.adobe.com/photoshop/using/whats-new.html
In the case of PDF , the dialogues that follow decide whether content will be lost or kept e.g. Editability, downsampling etc so it goes into Save a Copy
Dave
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