Improve Support for Large File Uploads

Please improve the file-sharing and import system to support very large files more reliably.

Large medical textbooks and references, such as Snell's, can be difficult or sometimes impossible to upload or share with the app. This is especially inconvenient for students who need to work with large medical references.

Please consider:

• Increasing the maximum supported file size.

• Improving the stability and speed of large file uploads.

• Allowing uploads to continue reliably in the background.

• Showing clear upload progress and the remaining time or percentage.

• Allowing an interrupted upload to resume from where it stopped instead of restarting from the beginning.

• Preventing the app from failing or closing when processing large files.

• Optimizing memory usage when importing large PDFs, especially on mobile and tablet devices.

The goal is to make importing large medical textbooks and other large PDF references as reliable and convenient as importing smaller files.