Running bellow command i can`t see any file on slack channel

slackUploadFile(channel: "report-automação", credentialId: 'XXXXXXXXX', filePath: 'resultado.txt', initialComment: 'Resultado')

slackSend command is running without any problem. The same command on other channel is running too.

I didn`t receive any kind of error when I run this command on Jenkins, just can`t see the file on channel.

My suspect is that the command is not prepared for special characters on the name of channel because if i send special characters on initialComment parameter, these characters are wrong on slack, so, maybe channel parameter have the same problem. slackSend command don`t have these problems.