Thank you Pushpank for actually providing dimensions! I have no idea why it's like pulling teeth to get a specific answer to certain questions such as this one. Seems like a reasonable question with universal application for the platform.
300 x 300 got me close, but as it turns out, however, it appears to me that 300 x 225 is actually an even better fit. (I'm not technically savvy in this area, though, so I'll look forward to some more informed input!)
Thanks for the info David!
I've been looking for more updated info since the "common" thread referred for this issue is a bit outdated (the dimensions they suggest don't work perfectly now).
Your suggested 300x225 dimension fits oerfectly . Though you don't need to limit your images to such a small resolution.
I calculated the aspect ratio of the ideal thumbnail, using your suggested dimensions, and confirmed it's 4:3. Knowing that, you can use this Online calculator to resize your images accordingly. With which you can upload a thumbnail in any dimensions you want, while still making sure that it'll fit well (Remember though, that the images must be in .jpeg format, under 5MB and no larger than 4000x4000 px)
I've tried it with some of my portfolio pieces that needed better cropping o nthe thumbnails, and it has workled 100% for each case. I hope this bit of info is helpful.
You mention the best aspect ratio to use and the max file sizes allowed, but are you able to shed any light on what the optimum file setup would be as far as pixel size goes? I uploaded an image at 3350px at its largest side, and though Upwork "accepted" and uploaded the image, it was compressed drastically making the quality look very poor.
Thanks in advance!