File Dropper widget - How to resolve error coming while doc upload

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I have newly configured File Dropper widget.  My Plain domain model is: -  1. MyAppEmailAttachment: - Generalized with EmailTemplate.Attachment entity and has *-1 association with MyAppEmail entity. Provided Read/Write access with New Object create & delete under entity Access Rule.  2. MyAppEmail entity:- Generalized with EmailTemplate.Email entity. Provided Read/Write access with New Object create & delete under entity Access Rule.   I have only configured File Dropper widget with Entity & Attribute under Data tab. rest other tabs are default. While uploading files (even single too) getting error as below.  After that removed all the provided default restrictions of widget under Restriction tab. still getting same error. Please suggest me if anything I am missing in configuration.
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3 answers
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I think it is due to the mimetypes not set properly.

please use application/* in the MimeTypes field

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This lines needs to correct.image.png

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I have noticed one more thing that after dropping files in dropzone, first blank item gets added into list with no file name and 0 size. How to handle it? 

Any idea?

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