Upscale Image for DTF Print

I already have the artwork saved as both PNG and JPEG, but the files seem to be too low-resolution for my DTF printing software. The upload keeps failing, and I suspect the issue is the DPI. I’m not sure what the current resolution is, nor do I know exactly how high it needs to be—just that it has to meet typical DTF print standards and upload without errors.

Here’s what I need from you:
• Examine my PNG and JPEG originals, determine their actual resolution, and let me know what you find.
• Upscale the artwork so it’s truly print-ready (300 DPI or whatever you recommend for crisp DTF output).
• Return the final file(s) in the same formats—PNG and JPEG—verified to upload smoothly into a DTF workflow.

Once I can drag-and-drop the new file into my DTF program without a warning message, we’re done.