Split it into several smaller parts with 7-Zip: right-click the file or folder, 7-Zip, "Add to archive...", and under "Split to volumes, bytes" enter for example 1500M. Upload all the resulting parts (.001, .002, ...) with this transfer. The recipient puts them in one folder and opens the .001 file - 7-Zip reassembles the rest by itself.
Drag & drop files here
or click to select
Transfer Complete
Your files have been encrypted, scanned and sent.
A summary email has been sent to you with a revocation link. Each recipient received an individual download link. No recipient can see the other recipients.