Is it possible to upload html file using File Manager for Javascript Integration

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Hello,

I'm trying to use Javascript API to make some simple validation in Incident Workspace. I created a html file with javascript included, and tested it successfully by pointing the url of the web browser control to html file in my local computer. Now I need to upload it to server. Is it possible to upload that html file to RN's server using File Manager then get the url, so that I don’t need to use any external server. 

I've tried to upload html file to custom script folder, but seems like it is only allowed to upload php files.