A user is unable to upload files to the corporate servers from their mobile phone when outside the office, but uploading files works without issue in…

The user can upload files on the office Wi-Fi but not when outside, which strongly suggests the issue is with the cellular data connection. Dismissing an error notification is a key detail. Mobile operating systems and cellular carriers often have data usage limits or a "Data Saver" mode that can restrict background data or large file transfers to prevent overage charges. The error message likely warned of this limit. Checking the device's cellular data usage settings is the most logical first step to diagnose the root cause.

B. Enabling airplane mode would disable all wireless radios, including cellular, making it impossible to connect to any network.

C. While rebooting is a general troubleshooting step, it does not address the specific symptom of failure only on cellular data.

D. Bluetooth is a short-range wireless technology used for connecting peripherals and is not used for uploading files to corporate servers.

1. Google. (n.d.). Reduce & manage mobile data usage on Android. Android Help. This guide explains how to check data usage and how Data Saver mode can "prevent some apps from sending or receiving data in the background."

2. Apple Inc. (2024). View or change cellular data settings on iPhone. Apple Support. Document ID: S1112. This guide details how to monitor cellular data usage per app and how Low Data Mode works, which "helps apps on your iPhone reduce their network data use."

3. Federal Communications Commission (FCC). (2023, August 10). Managing Your Wireless Data Usage. Consumer Guide. This official guide explains how carriers may "throttle" or slow data speeds after a certain usage threshold is reached, which could cause uploads to fail.