Check for short outages before a cloud upload

A large cloud upload can take hours, so even a brief connection outage may interrupt it or force the app to retry. A quick speed test might look fine and still miss dropouts that happen only now and then.

Use the Connection Stability test to watch response time, jitter, lost requests, and dropouts over a few minutes. Run it once before the upload and again while the upload is active. This helps you tell whether the connection is steady at rest and what changes under load.

Check for brief outages

1. Open the Connection Stability test on the same device and network you plan to use for the upload. Let it run for a few minutes so it has time to catch intermittent problems.
2. Note the results for response time, jitter, lost requests, and any dropouts. Also note the time, whether you are on Wi-Fi or Ethernet, and whether other devices are using the network.
3. Run the test again while the cloud upload is active. Start the test, then start or resume the upload. If the upload is already running, leave it going while the test collects results.
4. Compare the two runs. If practical, repeat the test on Ethernet or closer to the router. Change one thing at a time so you can see whether the connection method or location matters.

Use the same computer, room, and cloud service for a useful comparison. Do not treat one run as a guarantee: a short test can miss an outage that happens later, and a cloud service can have its own delays.

What the result means

No lost requests or dropouts in either run

The connection responded consistently during the test window. That is a good sign, but it cannot promise that a longer upload will never be interrupted. Leave the cloud app's resume or retry option enabled if it offers one, and avoid closing the laptop or browser while the transfer is active.

Problems appear even before the upload

If the idle run shows lost requests or dropouts, the connection is unstable independently of the large transfer. Wi-Fi interference, a router problem, an ISP interruption, or a fault in the device's network connection could be involved. Repeat the check on Ethernet if possible. If the wired result is also poor, the issue may be farther along the connection than your Wi-Fi.

The idle run is steady, but problems appear during the upload

The upload may be filling the available upload capacity, making other requests wait or fail. That does not automatically mean the connection is physically disconnecting. Check whether the cloud app pauses or retries at the same time as lost requests, and compare with a smaller upload or a different time of day. For more on this pattern, see why internet speed drops when a backup is running.

Response time rises, but requests are not lost

A higher response time means replies are taking longer. Jitter is variation in that response time. These changes can make calls or remote work feel sluggish without proving that the connection went fully offline. If the upload continues normally, congestion may be more likely than a complete outage.

How to reduce interruptions

1. Pause other transfers for a baseline. Stop other large uploads, downloads, and cloud sync jobs, then run the test again. If the result improves, resume tasks one at a time to find what is competing for the connection.
2. Compare Wi-Fi with Ethernet. Connect the computer directly to the router with an Ethernet cable if available. If that steadies the result, focus on the Wi-Fi link. If it does not, keep checking the router, modem, and internet service.
3. Improve the Wi-Fi path. Move closer to the router and avoid placing it behind a TV, inside a cabinet, or beside large metal objects. Pause and repeat the test after each change. A stronger-looking Wi-Fi indicator alone does not prove that packets are arriving reliably.
4. Reconnect to the network. On Windows 11, open Settings › Network & internet › Wi-Fi › Manage known networks, select your network, and choose Forget, then connect again. On macOS, open System Settings › Wi-Fi, open the details for your network, and choose Forget This Network, then rejoin it. On an iPhone, use Settings › Wi-Fi; Android menu names vary, but the Wi-Fi network details usually include a forget option.
5. Restart the router and modem. Unplug them, wait about 30 seconds, and reconnect them. Wait until the connection is fully back before repeating the test. If the dropouts return, check your provider's outage information or contact support with the times you recorded.
6. Check the upload device's connection. If only one computer has trouble, on Windows 11 review Settings › Network & internet and install available updates through Settings › Windows Update. On a Mac, check System Settings › General › Software Update. If other devices also drop at the same time, focus on the router or service instead.

Separate a connection outage from an upload delay

A cloud app may show a stalled progress bar while the connection is still responding. The service could be processing files, retrying a request, or limiting the upload rate. Conversely, a brief internet interruption may be hidden by automatic retries, so the progress bar can appear to keep moving.

Compare the app's pause or retry times with the Connection Stability results. The test measures requests between your browser and its test service, not the route to your cloud provider, so it can reveal general instability but cannot prove exactly where a cloud upload failed. If the test stays steady while one cloud service stalls, contact that service's support with the upload time and any error message.

For a long transfer, use a reliable power connection and keep the device awake until the cloud app confirms that the upload is complete.