Click green flag, and then press space or up. Space: write mode. Sets the cloud variable Up: read mode. Same as write mode, but without changing the cloud data Max total digits (including decimal point and negative sign): 256 An empty string is valid? Conclusion: It seems like Scratch only posts the data if the variable is a) a valid number and b) is a string with length <= 256. The project contains an example for checking for a valid number
