When Quickfields says invalid Object name which object is it referring to? The Entry Name, The Path Name? Usually it will have a red exclamation next to the object which needs attention but in this case it doesn't, it just says that the object name is invalid.
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It could be either one. Are you setting the path or the name with a token? This error is usually caused by having newline characters or something along those lines in either the document or folder name. It usually comes from Zone OCR reading multiple lines or a Pattern Matching token extracting multiple lines from full page text.
Aha! That is what it was, it was a strange character with no length in the file name. There is a space in one spot where you must press delete twice to remove the single space, so there must be a hidden character there, after deleting that character it stores. In the past I have always been notified like this when this happens:
I always try to use substitution if it's available to me. I substitute out any of the characters that are not allowed in names or shouldn't be there unless I want them like an extraneous \ symbol as well as any new lines and such. If I know it should only be alphanumeric & common punctuation, I'll use something like this:
[^\w,\-&] (this gets rid of anything except a word char (which can be numbers plus the , - & symbols.