Some advanced configuration may be required in order for the Bulk Uploader to perform optimally on your specific server setup.

As part of its upload process, the Bulk Uploader addon writes files to a couple of different locations on your server. For this to work correctly, these folders and their contents (including any subfolders) should be write-enabled for the user running the PHP process:

addons/bulk_uploader/uploads/
addons/bulk_uploader/tokens/

When in doubt, CHMODing these folders to 777 should do the trick. 755 should be sufficient for servers running SuExec, and Windows-based servers should un-set the Read Only flag.

Bulk Uploads can require large amounts of time and memory to execute fully. Depending on the size of the files you're Bulk Uploading, you may need to adjust PHP's max_execution_time or memory_limit settings. The Bulk Uploader will attempt to automatically increase those limits for you if possible, but some server configurations may require them to be adjusted manually.

Often, you can increase those limits via edits to your php.ini file. If not, your hosting company may be able to provide further guidance.