Or just to save time you can open the picture Wherever it is, saved at. Don't.
Click on it just right, click and and just change the ending where you see the .jpeg
Or whatever & just change it to .jpg

This is a breakdown of what the file names mean: The most common formats for pictures are JPEG (or JPG), PNG, and GIF.
JPEG is often used for photos and images with complex color.
PNG is popular for graphics, logos, and images needing transparent backgrounds.
GIF is primarily used for simple animations and images with limited colors.

I know it's complicated but once you get the hang of it , it's really easy to do.