Some slides are not properly named when creating a Multichannel Presentation from a Vault document using a Microsoft PowerPoint source file.
The affected slides of the source file do not have a title listed in Outline View within Microsoft PowerPoint.
The solution is to ensure that there is a title listed in the Outline View for each slide of the source document when it is created using Microsoft PowerPoint. Once the source document has been updated, it must be uploaded into Vault as a new document version.
Vault Multichannel Documentation: Field Defaulting on Slides