Upgrade from OJS 3.2.1-4 to OJS 3.3.0-3 fails. PDOException ... Can't create table ... Foreign key constraint is incorrectly formed

[navotera]

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Serious issue with Database upgrade (failed from 3.2.1.3 to 3.3.0.2)

I can answer my own question. Go to phpMyAdmin (or MySQL workbench or whatever database manager you’re using) Open your OJS database Click and open the submission_files table. If you’re using phMyAdmin, all of your tables should be listed as soon as you open your OJS database, so scroll down and click submission_files. In the top menu, click Operations. In the middle of the page, you’ll see Table Options. Choose InnoDB in the drop down menu for Storage Engine and click the GO button beneath. I…