Exporting with the base64 option on should not generate a link to a file, but an inline representation of the image inside the MD file.
However, I don’t expect the result to report (null) as the image data. Can you drag out the attachment from Bear to your Desktop? If you export without the base64 option, does the attachment get exported correctly?
I can drag the image to my desktop without any issues.
I exported without the base64 option and the attachment was exported correctly (I reviewed the markdown and it was as expected, I then copied to an Obsidian vault in case I overlooked and the markdown rendered with the image as expected.
I don’t need the base64 export option and didn’t realize what I was choosing. I’m happy to continue to troubleshoot, but my problem is solved. Thanks for your time.