At Xray, all attachments included in Test Steps and attachments from Execution Results ( like the screenshots, you add as evidence) are stored in a dedicated database.
Considering the Xray edition you have, you need to take in consideration the following storage limits:
- 50 GB per Xray instance for Xray Standard.
- 3 TB for Xray Enterprise.
If you want to track your current storage usage, please check Storage, at Jira Settings > Apps > Xray.
Learn more how to manage storage at: Global Settings: Storage