Currently, FileHandler can only handle cases where the mxc uri does not change. Changing the mxc uri after the FileHandler is created has no effect.
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This comment was removed by nannanko.
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content of event does not indicate itself whether it is encrypted or contains a thumbnail. FileHandler.qml handled this case, it accepts eventContent rather than mxcUri(And mxcUri should not be set manually).
If some file is needed to be download/upload without eventContent, the functions in KazvIOManager should be used.