c# - Issue with BackgroundTransfer not saving the downloaded file -

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i have issue background transfer service:

i trying download file onedrive using backgrounddownloader, transfer seems effective (some bytes transfered), transfer seems never end, , @ end file downloaded size 0 bytes. in addition, transfer never ends because if launch second transfer, never starts (except if switch network connectivity (wifi on/off)).

i have tried same link in background transfer sample ms, gets same behavior. have used same link in ie, , transfer goes well. have tried many files (mp3), result same. have added: 

download.costpolicy = backgroundtransfercostpolicy.always;

but still same result. have tried on wifi, debug, release.

any idea why file not saved? (i have enough space on sd card of course)

if no answer found, know implementation of background transfer service use instead of official one?


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