I can't seem to successfully apply this to a texture. I am trying to give this glint to the Jigsaw item. If anyone knows how to do this, please let me know!
I'm not sure what you're asking. If you enchant an item, it'll use the enchantment glint texture. It may not be obvious because of the odd way in which the game applies it, but it does work.
If it's not changing from the default glint texture then you'll need to provide more information. What Minecraft version are you working with? What is the file name of the glint texture? What is the exact path of the enchantment glint texture relative to /assets/ ?
I was starting to suspect. v_v Do you happen to know how to apply particle effects to an item?
You're better off asking in the modification development or map making forums, depending on what your purpose in asking these questions is. Again, this isn't something that's done with a resource pack.
Resource packs can only change the graphics and sounds. They cannot generally add things to the game. That includes things like particles where there usually aren't any.
Thats alright, I found like stuff where it talked about "overrides" but I can't figure out how they are used. I can't find any documentation. Stuff you add to the image.png.mcmeta file.
The image.png.mcmeta files are used for animation, not particles or the enchantment glint.
I think that wherever you're getting this stuff isn't giving correct information, or at least is giving incomplete information in a confusing way. Keep in mind that there's a lot of things that are done with server plugins that people show in videos and may even claim to be resource pack features even though they're not.
It might be better to give an example of what you're trying to accomplish and approach things from that end. The method to accomplishing it may be different than what you want, but if the end result is similar then does that really matter?
For example, you can just animate an item's texture to always have a 'shimmering' effect similar to the enchantment glint. It won't be exactly the same in terms of visuals, but it will mark the item as being special. If that's what you want then just using some clever image editing and Minecraft's built-in animation system may be good enough.