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The old 10MB cap was checked against the wire body, but two base64 layers
sit between the raw file and that body: crypto.js base64-encodes the file
before AEAD encryption, then nym.Client.Send base64-encodes the ciphertext
again to embed it in the JSON sent to the local nym-client over its control
WebSocket. A file at exactly the old cap produced a wire body just over the
limit after the first layer, and would have blown nym-client's own hardcoded
16MB WebSocket message limit after the second, surfacing as an opaque 500.
Lower the wire-body cap to 11MB, which keeps the second base64 layer with
real margin under nym-client's 16MB ceiling. Effective safe raw file size
is now roughly 8MB, not 10MB.
Reported by Ch1ffr3punk on nym.forum, reproduced with an exact 10MB file.
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