Hi! I see you're experiencing crashes in the Darkroom app when exporting large RAW photos to JPEGs on your iPhone with iOS 18.7. Let's try to get this sorted out for you.

To get started, have you tried any steps already like restarting the app or your phone? Also, are these crashes happening consistently with all large RAW files or just specific ones?

Meanwhile, here’s a step-by-step approach that often helps resolve export crashes in Darkroom:

1. Restart Darkroom and Your iPhone: A fresh start can clear temporary glitches. Close Darkroom completely and reboot your iPhone.

2. Check for App Updates: Ensure you have the latest Darkroom version installed. Some memory-related crash fixes, especially for RAW exports, have been added in recent updates.

3. Reinstall the Darkroom App: Reinstalling can clear corrupted settings or data that may cause export failures. Backup your work if needed before uninstalling.

4. Export Smaller Batches or Reduce Image Size: Since large RAW files can be demanding, try exporting fewer photos at once or reduce their resolution slightly within the app settings to lessen memory load.

5. Close Other Apps Running in Background: This frees up device memory, which helps with resource-intensive tasks like exporting RAW photos.

If you've done these or if the problem persists, it might be related to a specific memory bug in exporting RAW with certain effects or masks applied (this has been noted in some versions). In that case, avoiding foreground or background masks during export or updating to the very latest app build could help.

Let me know which steps you've tried or if you'd like me to guide you through any of these in more detail! Are you currently on the latest version of Darkroom?