No. Eagle does not currently support pausing or resuming file or folder imports.
If an import is interrupted, it must be restarted from the beginning.

Why Imports Cannot Be Resumed

When adding or importing files, Eagle processes previews, metadata, and indexing in multiple steps.
Partial progress is not currently saved, so interrupted imports cannot continue from where they stopped.

Why Large Imports May Take a Long Time

Import speed mainly depends on:

Storage performance
SSDs are significantly faster than traditional HDDs and are strongly recommended.
File types
Common image formats (JPG, PNG) import quickly, while complex files (PSD, 3D, Office documents) take longer.

Tips to Improve Import Stability

To reduce interruptions and improve reliability:

Add files in smaller batches instead of importing everything at once
Perform large imports when your system is idle
Avoid running other resource-intensive applications during the import process

Can I Pause or Resume Adding or Importing Files in Eagle?