First of all you are using Kodular, so you should ask your question there
Unfortunately you did not provide a screenshot of your relevant blocks, so we only can guess what happened...
Follow this advice
Most probably you are trying to upload or download from/to a directory, which is not accessible anymore? Use only shared storage or ASD, see also Some basics on Android storage system
And if there are still issues after following this advice, open a new thread in the Kodular community. Thank you.
Taifun
PS: I will close this thread