When connected to my ctrlX OS device via the IXON WebAccess its not possible for me to upload a app (or another file) which is bigger than 16 MB. The error I get is either "Error when uploading files - 413 Request Entity Too Large" (V3.6) or "Upload failed! File is too large. If your are connected via remote access, the maximum file size may be restricted." (V4.4).
See my screenshot: