Bug: 4GB limit to Textures in standalone build

This is a limit of the maximum file size for resources. Resources are packed into a single file during the build. The file contains a header and one of the fields inside the header is size, this is stored as a 32 bit unsigned integer, the limit of which is 4GB. There has been some research into changing the size property to a 64bit unsigned integer but it is not a simple task due to backwards compatibility.

I suggest you look at using AssetBundles as an alternative, they are a much better way to work with large amounts of assets.

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