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First, that schema error message is bad; should not be String but
Filesize.
Second, this is a bit of indirection; the max filesize is determined
by the system_config/crossbar doc, under the 'max_upload_size' key.
Try changing the limit there:
sup whapps_config set_default crossbar max_upload_size {SIZE_IN_BYTES}
And try your upload again.
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