General guidelines for using attachments in offline mode

When working with attachments in offline mode, keep these general guidelines in mind for usability and a good user experience.

Note: Many of the issues discussed can be resolved using system properties. For more information, see System properties in offline mode.

• Controlling offline attachment file types

  Define which file types can be downloaded offline using the glide.sg.offline.attachment.allowed_content_types system property, for example, image/png or image/jpg. This property prevents irrelevant or unsafe files from being downloaded, keeping offline storage lean.

• Limiting attachment file size for offline use

  Use the glide.sg.offline.attachment.max_size system property to set the maximum size in bytes for a single attachment downloaded offline. Files exceeding this limit aren't downloaded and display as a placeholder, preventing large attachments, such as long videos, from causing performance issues or filling device storage.

• Total attachment storage limit

  Use the glide.sg.offline.attachment.max_total_bytes system property to cap the total storage space allocated for offline attachments. The default is 50 MB with a maximum of 2 GB, ensuring attachments don't fill up a user's device storage.

• Image attachment handling in offline mode

  Image handling when taking pictures in the activity stream differs by platform:

  • Android: Images are automatically compressed to approximately 75% quality and converted to JPEG format, regardless of the original file type.
  • iOS: Images are uploaded as is, with no compression or format conversion applied.

Parent Topic:Attachment behavior in offline mode