The default for uploaded images appears to be /storage/app/public/profiles/, but the frontend generated URL of /storage/profiles/image isn't being found.
I tried to find any sort of routing for that directory and haven't been able to do so. Any help would be appreciated.
You must link to the storage directory. From the documentation:
Once Spark is installed, you should link the public/storage directory to your storage/app/public directory. Otherwise, user profile photos stored on the local disk will not be available
And the relevant code:
ln -s /path/to/storage/app/public /path/to/public/storage