Why this helps
A large file may take hours. Sending it in parts means one short network problem does not have to erase all confirmed progress.
What TransferSize keeps
The open upload session records finished parts and retries the one that failed.
- Progress, speed, and time left
- Retry for failed parts
- A final size check
1Confirmed
2Confirmed
3Confirmed
4Retry
5Waiting
6Waiting
Keep the upload session open. A failed part can retry while confirmed parts are retained.
Illustration of part retriesIf the connection drops
What to do next
| What happened | Your next step |
|---|---|
| Connection briefly dropped | Keep the tab open, reconnect and watch the existing upload. |
| A part is retrying | Allow the retry to finish; do not start another copy. |
| Tab closed or page refreshed | Do not assume progress will return. Follow the interruption guide. |
| Upload is checking files | Wait for Transfer ready before sharing. |
Keep the tab open
Recovery works inside the active upload session. If you close the browser or let the session expire, you may need to start again.
Know what “resume” means here
A part retry during an open session is different from reopening a closed browser tomorrow. Keep the device awake, the upload tab open, and the source files connected. Follow the recovery message the uploader provides rather than assuming every kind of interruption is recoverable.
Useful detail
A normal file, checked before sharing
You still receive one normal file
Splitting the upload into parts happens behind the scenes. Your recipient does not need special software to join a pile of pieces. They download the selected original. The benefit is in how the upload deals with interruption, not in changing the file format.
The final check is part of the job
After data has been sent, the service still needs to confirm the transfer. Wait for Transfer ready and the finished link. If you are delivering work to a deadline, leave time to open the public link and verify a downloaded file, not just time for the progress bar.
Questions
Questions people ask
Can one failed part damage the file?
TransferSize checks each part and the final byte count before it creates the link.
Does the browser hold the whole file in memory?
No. It reads and sends smaller parts.
Can I close the browser and come back later?
Do not rely on that. Keep the page open until Transfer ready appears.
Your next step
Fix an interrupted upload →Use the recovery guide before refreshing or starting another copy.