I have had this problem for years, I can export to PDF on the development apps locally but not on any hosted apps (on Linux), Scriptcase came up with, it will be the permissions that need setting, that didn’t work so I gave up and removed all PDF exporting that used (wkhtmltopdf) until now. I now host with https://scriptcase.host which was https://hoo.st and I’m using v9 SC. I contacted support and they told me the wkhtmltopdf file was corrupt and they have replaced it and it now works, so I did a bit of testing with uploading the wkhtmltopdf file and found that when uploaded it removed some of the code in the file. So I zipped the file and then inflated it on the site and the file size was the same as the none corrupt one. So that’s the answer get the good file, zip it and replace the one online on your site. The corrupt file wkhtmltopdf-amd64.bkp size was 37.89MB and the good one wkhtmltopdf-amd64 size was 37.96MB these sizes are the online sizes.