I have an issue where with file validation where I am able to upload a .docx file (as expected) but another use gets an error that the file type is invalid (unexpected).
Any idea why it would work for me but not for another user?
Hello, @MikeH
Thanks for your question.
Please allow me to mention that there is a lot of reasons for the reproduced issue. Usually, you can find the error message, where can be indicated the reason. For example, the uploaded document can be too large.
In order to provide you a clear answer, we need some additional details from you. Please provide us:
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error screenshots from debugger and browser console ( here we can find the error code and more details about it);
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how to reproduce your issue;
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the preconditions, for reproducing this issue;
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the screenshots of the workflow for your uploader.
Also, allow me to recommend you to analyze the documentation for the plugin, in case of necessity: https://docs.zeroqode.com/plugins/multi-uploader-plugin
Looking to hear you soon.
Best regards,
- I have analyze the documents.
- The screenshot is attached.
- Your assessment doesn’t really make sense to me. How are there a lot of reasons why one user would get an error trying to upload the EXACT file a different user successfully uploads. It seems if the file is too large, or an invalid type, it would fail for both users not just one of them. Please notice the users are uploading the EXACT same file and it is working for one user and failing for the other.
Hello, @MikeH
Thanks for the screenshot and additional details.
I’m sorry, but it wasn’t initially noted that both users were using the same file. Thanks for that details 
Please allow me to check this issue with our team and to revert with an update at the nearest time.
Thanks for the understanding.
Best regards,
Hello, @MikeH
Thanks for the patience.
By this message, I would like to let you know that we have analyzed the occurred issue with the uploading of the documents.
The library that the plugin uses does the verification based on the MIME File Type that it requires from the browser.
The hard-coded lists in the browsers are pretty limited. Often, the MIME-type sent by the browser will be the one reported by the OS.
In your case, it is necessary to сheck the MIME type for any operating system. You can check it here:
https://codepen.io/rikschennink/pen/NzRvbj](https://codepen.io/rikschennink/pen/NzRvbj
The list of MIME types: https://cdn.awstatic.com/pub/list-of-mime-types-by-content-type.pdf
Unfortunately, but this case depends not only on the plugin functionality but on the used browsers and OS.
Please follow the feedback above 
Best regards,
Hello, @MikeH
Please allow me to note that we have analyzed repeatedly the possibility to upload documents with the “Advanced Multi Uploader” plugin.
Due to the library, which is used for this plugin, the appeared issue was not related to the plugin functionality, but to the system to which the browser refers.
Allow me to recommend you to specify all possible permissions in the plugin settings.
In case I can help you with something else - please let me know.
Best regards,