What is the best & Trusted plugin for file upload..?
File Upload: http://vanillaforums.org/addon/fileupload-plugin
You may need to get the GitHub version here: https://github.com/vanilla/addons/tree/master/plugins/FileUpload
Check out the Documentation! We are always looking for new content and pull requests.
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I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.
it all depends on your version of vanilla.