Setting the max size to 0 should disable the max size

src/github.com/turt2live/matrix-media-repo/client/r0/upload.go

@@ -34,7 +34,9 @@ func UploadMedia(w http.ResponseWriter, r *http.Request, db storage.Database, c
 		contentType = "application/octet-stream" // binary
 	}
 
-	r.Body = http.MaxBytesReader(w, r.Body, c.Uploads.MaxSizeBytes)
+	if c.Uploads.MaxSizeBytes > 0 {
+		r.Body = http.MaxBytesReader(w, r.Body, c.Uploads.MaxSizeBytes)
+	}
 
 	request := &media_handler.MediaUploadRequest{
 		UploadedBy: "",