after update OJS 3.0.2 Feature update not used and invalid type. Please solution step by step . Thanks
Could you double check the permissions on your public and files folder?
Have you search for other similar issues in the forum and try to apply any of the suggestions there: http://forum.pkp.sfu.ca/search?q=no%20file%20uploaded%20or%20invalid%20file%20type ?
Best,
Bozana