I don't know why, but recently I am not able to submit a PDF and then see it embedded on the browser. It used to work perfectly.
I found out that the /files/journals/x/articles/x/public/ folder is empty for those articles that can't be seen on the browser, and older articles, that can be seen, have a PDF file on the public folder.
I tried copying the PDF file to this folder, in order to see if this could be the problem, but I don't have enough permissions. Tried to give 777 permission to this particular folder, but couldn't (it's the only folder on the entire system that I can't, for some reason, change permissions).
It can be seen here:
PDF viewer not working: www.uel.br/revistas/dominiosdaimagem/in ... view/79/47
PDF viewer working: http://www.uel.br/revistas/dominiosdaim ... view/37/23
Does anyone have a clue about what could be the problem?