There are some examples for messages and attachments filtering behaviour explanation.
All examples has the same input set of emails. Each example explains specific configuration properties combination.
Input email details
[{"ID":"6ce41109e@intelstudios.onmicrosoft.com-730b4889-@AM7PR066.eurprd07.prod.outlook.com","Subject":"Without attachments","From":[{"Name":"Microsoft Outlook","Address":"MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@intelstudios.onmicrosoft.com"}],"To":[{"Name":"","Address":"test@intelstudios.com"}],"DateSent":"2022-08-26T09:27:16Z","DateReceived":"2022-08-26T09:27:15Z","BodyText":"some content","Attachment":null},{"ID":"6ce411649e@intelstudios.onmicrosoft.com-730b4889-@AM7PR066.eurprd07.prod.outlook.com","Subject":"With more attachments (inline and also attached)","From":[{"Name":"Microsoft Outlook","Address":"MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@intelstudios.onmicrosoft.com"}],"To":[{"Name":"","Address":"test@intelstudios.com"}],"DateSent":"2022-08-26T09:27:16Z","DateReceived":"2022-08-26T09:27:15Z","BodyText":"some content","Attachment":[{"Name":"priloha1.pdf","IsInline":false,"Content":"c2FkZiBhc2Zhc2Ygb2lhbndvZiBhdw=="},{"Name":"img_arrow-right.png","IsInline":true,"Content":"c2FkZiBhc2Zhc2w=="},{"Name":"priloha2.png","IsInline":false,"Content":"2FkZiBhc2Zhc2Ygb2lhbndvZiBh2FkZiBhc2Zhc2Ygb2lhbndvZiBh2FkZiBhc2FkZiBhc2Zhc2w=="}]},{"ID":"6ce411649e@intelstudios.onmicrosoft.com-730b4889-@AM7PR066.eurprd07.prod.outlook.com","Subject":"With only one attached attachment","From":[{"Name":"Microsoft Outlook","Address":"MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@intelstudios.onmicrosoft.com"}],"To":[{"Name":"","Address":"test@intelstudios.com"}],"DateSent":"2022-08-26T09:27:16Z","DateReceived":"2022-08-26T09:27:15Z","BodyText":"some content","Attachment":[{"Name":"priloha2.pdf","IsInline":false,"Content":"c2FkZiBhc2Zhc2Ygb2lhbndvZiBhdw=="}]},{"ID":"6ce411649e@intelstudios.onmicrosoft.com-730b4889-@AM7PR066.eurprd07.prod.outlook.com","Subject":"With only one inline attachment","From":[{"Name":"Microsoft Outlook","Address":"MicrosoftExchange329e71ec88ae4615bbc36ab6ce41109e@intelstudios.onmicrosoft.com"}],"To":[{"Name":"","Address":"test@intelstudios.com"}],"DateSent":"2022-08-26T09:27:16Z","DateReceived":"2022-08-26T09:27:15Z","BodyText":"some content","Attachment":[{"Name":"img_arrow-right.png","IsInline":true,"Content":"c2FkZiBhc2Zhc2w=="}]}]