I have AI images sized 4,096 px.x 4,096 as ,png files.
Can I save as ,jpg in Photoshop to submit?
In the program I am using I can only dowload as .png files.
Is the size large enough to submit?
Minimum image resolution is 4MP, so you'll have to do the math. PNG file extension should only be used for images with transparency, so, yes, you'll have to use Photoshop to convert to jpg before submitting.
You have to use a program to convert your PNG files to JPEG if there is no transparency in the asset. The JPEG file size should be anything between 2Mb and 40Mb. File size will depend on the image itself and the quality factor you use to convert. A 2Mb file should be good. When I convert, I target 4Mb. This is mostly independant from the resolution.
If the resolution is not adequate, the system will refuse the upload.
@Jill_C : 4k assets are 16Mp, so that is quite enough.