how to embed thumb into eps file without destroying editability?

Hello @kajzica,

Thanks for reaching out. I hope the suggestions shared by Mylenium helped resolve the problem. If not, 

kindly record an action for exporting your EPS files with previews and then use the Batch command to process the entire folder of EPS files for which you want the same attribute. You may learn more about this here: https://helpx.adobe.com/illustrator/using/automation-actions.html.

Feel free to reach out if you need further assistance. We'd be happy to help.

Thanks,

Anubhav

The thumbnails are just a separate PostScript object/ datachunk and in the worst case could probably copy & pasted together in a code editor after the TIFF has been saved as a EPS. The specifics depend on the actual EPS version, though. Other than that you can likely "inject" thumbnails using standalone tools like TeXPDF or a Python library like PyPI. It's a bit nerdy and not easy to understand or get working at times, but if you really need it, it may be worth investigating.

Mylenium