Heat-press DTF and UV DTF stickers are not the same product. Phantom DTF prints both. Pick the one that matches the surface.
Heat-press DTF (apparel)
Use DTF Transfers by Size or the Gang Sheet Builder for shirts, hoodies, hats, and bags.
UV DTF stickers (hard goods)
UV DTF is a cured, peel-and-stick decal. No press. See the UV DTF Stickers guide.
File rules
Transparent PNG at 300 DPI. Do not mirror the art.