I cannot upload any file into Signavio Process Manager.
It states 'The Signavio file storage is not available in your workspace'.
Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental.
The storage option has been disabled in your workspace. If you are an administrator, and you want to change this setting, navigate to Explorer → Setup → Edit general configuration -> Enable uploading of documents (down below).
Documentation : Configure general software settings
KBA , BPI-SIG-PM-EXP , Explorer for SAP Signavio Process Manager , How To