GIMP is an open source free image editing tool.
It allows you to create artwork using the templates we provide.
However, GIMP's default save file format is XCF.
We do not accept XCF files at our store, so you will need to convert this to PSD.
Also, we will not accept XCF files in the future to improve the efficiency of our work.
How to convert to PSD
GIMP can easily convert to PSD format.
Open the XCF file in the GIMP and click File > Export. Select "PhotoshopImage" (PSD) as the file format and click "Export".
This completes saving the file as a PSD file.