Thank you for joining the conversation, CSACM treasurer.

I understand the inconvenience of not being able to preview attachments when you click on them. Like what JamaicaA said above, I suggest contacting our QBO Support to check your company file using more tools.

JamaicaA hyperlinked some helpful articles if you need some references in the future.

Feel free to reach back out if you have any other concerns. Take care and have a good one!