Why cant I add files (html, pdf) in some articles?

Software Support
1

I have tried to add files in some articles and I get the following message >>Stage not initiated. Any idea?

image

2

You need to “initiate the stage” passing the article from Copyediting to Production:
https://docs.pkp.sfu.ca/learning-ojs/3.1/en/editorial-workflow#moving-to-production

Cheers,
m.