Does Amplify.Storage support background upload?

[yusuftor]

I know that TransferUtility supports background upload. However, it doesn't mention this functionality anywhere in the Amplify docs for Storage upload. Can someone confirm whether this is or isn't possible, and if so how?

[lawmicha]

Hi @yusuftor, thanks for the link. It is possible because the storage plugin is implemented using TransferUtility, so if you perform an Amplify.Storage.upload/download, and background the app, the operation will continue to operate since it is using TransferUtility internally. This implementation detail is subject to change, which is why it is not documented as we have not explicited designed the storage plugin to do so.

There aren't any supporting APIs for background transfers on the storage plugin such as to store the application's handleEventsForBackgroundURLSession completion handler and wake the app when the transfer is completed, or allowing the developer to manage a transfer when a suspended app returns to the foreground. The capability to fully manage transfers is limited. With the exception of the functionality mentioned, does this support your use case? if not, could you expand on what you are trying to do?

[yusuftor]

Thanks for the quick reply @lawmicha. Is it possible to get hold of the underlying TransferUtility singleton from the Amplify instance? Actually I was wanting to use the handleEventsForBackgroundURLSession, and I thought maybe I could pass it to Amplify's singleton of TransferUtility.

[lawmicha]

Hi @yusuftor, technically it is possible by using the same key to reference the TransferUtility singleton that Amplify.Storage internally uses, but I don't think that is a robust way, another option would be to directly use TransferUtility if that functionality is a strong requirment for you. we have a feature request over here #1102 that is related this

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