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Front end post and upload file, image for users without plugin

There are multiple users who have to post their own post on respective post types (like news, reports etc) with feature image upload, extra file (pdf, txt, excel) upload button from the front end which is approve by the admin from backend.

I have solve for feature image but hanging my mind for file upload from front end for the respective post.

I have upload the file also from backend using metabox but no idea how to make it working from frontend to upload.Any suggestion?