Pattern fill bug

No problem, here you go:

In Photoshop, open your Patterns panel, Windows > Patterns. If you don't have any folders or individual patterns, or you are missing some of your patterns that were there before, you need to load them in. Note that my folders are going to look different from yours. 

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First, you can automatically load in the Legacy Patterns and More folders under the top left menu. Just click on that menu item and they will pop right into your Patterns panel. I suspect these folders have all the patterns you used to see before.

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However, if you are missing other custom patterns you've been collecting or saving, from the same menu, choose Import Patterns.

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That will open File Explorer. Search for *.pat. You may need to try searching in different directories (such as Documents and My Computer) if you don't remember where you saved special patterns. JEL_4-1768763704822.png

Once you've found your custom patterns, you can load them into Photoshop. Again, my patterns are going to be different from yours.

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If you have a shape or area defined and selected, and you want to fill it with a pattern, it should be at your fingertips like this:

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If you still don't see any patterns showing up, you may need to try resetting your Preferences or reinstalling Photoshop. Come back to let us know and we'll walk you through those processes.