Hello Alberto Pastorelli,
Thank you for reaching out to our technical support forum. I’m sorry to hear about the trouble you’re experiencing. Rest assured, I will look into this issue for you and work to resolve it as quickly as possible.
If you could kindly provide any additional information regarding the issue, it would greatly help me investigate and address it more efficiently. Please provide the correct location of your folder. Is it on your root folder or under images folder? Generally, this should not be an issue. Folders are accessible from SP Page Builder media manager if set in Media configuration.
Best regards