How can I allow certain file types to be uploaded in the Extra Question Field plugin?
Also I want to show the user an error which says " Only X, Y, and Z file types are allowed." (in red color) when the user wants to upload a file type other than what I mean.
I mean by file types this file extensions: tex, bbl, doc, jpg, pdf, png, txt, zip, ftx, log, bst, bib, cls, sty.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.
July 15, 2020: Q2A 1.8.5 released!