Designed a t shirt I really want to sell. However the design is like 800KB and obviously it has to be 25MB to upload the design. Tried using TinyPNG, saving to web, saving as JPEG then changing to PNG. I don’t want to ruin my design. Every time I try something is says “Provide a valid PNG”. I use photoshop. The image contains writing and it’s all drawn, a basic design with detailing nothing majorly artistic. I’m new to most of this so any other tips for the future when I design more and want to sell it would be much appreciated.
Any advice? Thanks