I used FileZilla 3.20.1 to upload my videos to Shutterstock with no problems for quite some time and still do it daily. So I did with Pond however about a couple of months ago it stopped working. FileZilla properly connects to Pond and uploads file till it shows 100% and either stays without doing anything or starts uploading over again. No file arrives to Pond. I can upload via Pond website but it is less convenient (if I queue more than 10-15 files half show error or, in case of large file, it does not upload at all - error almost straight away). Pond technical support did offer any meaningful help or explanation. Any thoughts/advises or anyone had similar problems?

It wouldn't connect via ftp for me, then I poked around on the P5 site and saw the ftp server had changed, so I changed that, but it wouldn't accept the password I tried to put in (nothing happened when I submitted it). I think a new browser solved that. Then ftp via FileZilla worked.

Thank you all for your feedback. It seems I solved problem - I can now upload with FileZilla, thanks to pancaketom for a hint. I deleted and put in my password again and did this to all FileZilla settings. Touch wood, it works now. Nevertheless upload via website remains a huge pain.