The Resume feature is only available in the Send Anywhere app depending on the file transfer way.
Especially when you are receiving large files via share-link, it is highly recommended to use Send Anywhere app. You can transfer more stable and faster without being affected by external environments such as web browsers.
6-digit Key Transfer / To Device Directly
Since both devices are connected and transferred one-time, you cannot continue to download the paused file.
You can continue downloading the paused file because the file uploaded to the share-link is stored on the server for a certain period of time.