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Unable to upload small files allowed on the list of files that can be uploaded on Experts-Exchange?

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I keep getting the error when trying to upload certain accepted file in EE. I have been struggling to get some files uploaded to EE but cannot due to the following errors.

The extension of one or more files in the archive is not in the list of allowed extensions: xl/worksheets/_rels/sheet1.xml.rels


Not sure why this is happening. The file comes from Google Sheets and is part of their download or export feature. I download it locally as an xlsx file then attempt to upload it to EE. It does not work. What am I doing wrong?
ErrorFromtrying-to-upload-XLSX-file-.png
XLSXFileUnableToUpload.png
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Andrew LeniartIT Professional | Freelance Journalist | Looking for Opportunities
Author of the Year 2019
Distinguished Expert 2018

Commented:
Sample code/data

Hi Fletcher,

Would it be possible to attach the file(s) in their current form that you are trying to upload so that I can try? I've never experienced the problem and have uploaded several files. Remove any personally identifiable information, then upload attach them here or to me in a PM to me if you prefer. If that doesn't work, zip them up and upload as a zip so we can extract them and try uploading ourselves.

Hope that's helpful.

Andrew Leniart
EE Topic Advisor
RUA Volunteer2?Tableau Trainer & Consultant Sales Exec.

Author

Commented:
I uploaded  the file. See original question.
Developer
Fellow 2017
Most Valuable Expert 2018
Commented:
Hi Fletcher,

You are not doing anything wrong. This is a bug in the EE uploader, and I've already submitted a bug report on it:
Upload of XLSX file fails

As you probably know, XLSX is really an archive file, and what seems to be happening is that the EE uploader finds a file inside the archive that is not in the list of allowed extensions. It doesn't happen on all XLSX files — just some. When it happens, a work-around is to save the file as XLS instead of XLSX, as XLS is not an archive format (and, of course, it is an allowed extension at EE). But note that Google Drive can download only in XLSX format (and DOCX) these days — it stopped support for downloading XLS (and DOC) years ago, so you'll need to convert it from XLSX to XLS with other software, such as Excel. Regards, Joe
Kyle SantosQuality Assurance Engineer at Dassault Systemes

Commented:
Hi Fletcher,

As Joe said, you're not doing anything wrong. His explanation is great and we'll investigate the issue.  

Joe, thank you for helping Fletcher!

Regards,

Kyle Santos
Customer Relations
Joe WinogradDeveloper
Fellow 2017
Most Valuable Expert 2018

Commented:
You're welcome, Kyle, and thanks to you and your team for investigating the issue. Regards, Joe