I have a JPEG or PNG file that includes your template. That's good to print, right?

The Short Answer

No.

Why?

When we are ready to print the artwork, we need hide the guideline layers so they do not appear on the final print. Some may misinterpret the template's grey and red guidelines, thinking we use them to calibrate our laser machine when cutting. Thus they save as a JPEG or PNG when they could easily just save to Photoshop PSD. 

The guidelines are specifically for your own use. They are present to help you align your custom artwork within the constraints of the control panel layout. For example, if you want to design around the joystick buttons or lever hole, the guidelines help you see where to position your graphic elements.

Here is the internal process that we use to send your artwork to our printer:

1. When we receive your artwork in Photoshop PSD format, we first align the artwork in our internal printing templates in Adobe Illustrator. We do this so we can ensure that when the artwork prints, we can later align it in our laser machine for cutting. 
2. We then return to Photoshop to hide the template guideline layers and resave the artwork.
3. In Illustrator, the image file updates automatically, thereby removing the guidelines while keeping the artwork in place with our internal templates. 
4. We then send the file to our printer.  

We explain things a bit more with this article: What does "Artwork Flattened to Control Panel Guide" mean, and why is my artwork on "HOLD"?

Here is an example of an order in which all layers are flattened - notice that the LAYOUT and OVERPRINT layers are missing, and the guidelines are merged to the art. We're unable to print this because we can no longer hide the guidelines.

Instead, flatten ONLY the artwork layers you designed in Photoshop, GIMP, Photopea or other free app.  Your layers window should look like this:

I grabbed a JPEG or PNG artwork from someone's fightstick portfolio and it has your template in it. Is that okay to print?

Often we receive artwork from a customer who happened to find and download someone else's design from places like Reddit, Discord or the wider internet. Usually, these folio examples are saved in PNG or JPEG format. For the same reasons mentioned above, players may figure it's exactly what we need in order to print the artwork, but it is not. We need the file with all layers intact. This typically comes in PSD format. If you don't have it, or cannot get it from the original artist, then please consider creating your own artwork in Photoshop or alternative free apps. You could also perhaps hire the artist that you found the folio artwork from.

Alternatively, you can find a desktop wallpaper on the internet and send that to us - we will perform basic adjustments and attempt to fit the artwork within the constraints of the layout. Please note that if we must adjust your artwork to fit the Fightstick because no template is provided, you waive the right to request a refund if the output does not match your expectations (ie something you wanted has to be cut out in order to fit).

Okay, I saved the JPEG or PNG file to Photoshop format. Are we done now?

I'm afraid not. If the original file already has the grey guidelines merged to the atrwork, then saving it in PSD format will not fix the issue.  We receive artwork like this as well - customers who aren't familiar with Photoshop or do not understand what layers are, but do have access to GIMP or other free apps will often export to Photoshop, thinking this will somehow satisfy the requirements. The image still has the guidelines merged to the artwork, and so we cannot remove them for printing. 

I'm an artist that sent my client a PNG or JPEG of the finished comission. That's fine to print?

An artist may decide to send only the PNG or JPEG version to their client because they cannot email large files, or believe they do not have enough storage space in the cloud to support storing client images they've completed.

As for the reasons mentioned above, we place the order on HOLD and ask the customer to submit the PSD file. You're not doing your client favors by sending a PNG or JPEG. 

If you're an artist earning money through comissions, it's best to consider a business plan that includes temporary cloud storage of current finished designs, with a removal date of 30 days.  This allows you to keep within your cloud storage costs. Often, free cloud storage is available that can store 2 or more gigabytes.