Kindly refer to the below note in the documentation https://experienceleague.adobe.com/docs/journey-optimizer/using/configuration/monitor-reputation/manage-suppression-list.html?lang=en where it states, it can take upto 60 minutes for the changes to take effect.  

CSV is the only acceptable file format at this pointIt is currently available as a private beta

@OptumSchlep You can refer to this tutorial where in csv upload option is detailed https://experienceleague.adobe.com/docs/platform-learn/tutorials/audiences/upload-audiences.html?lang=en  You can then target them in AJO (say using email channel) provided you have enrolled into a private beta https:...

No, it wouldn't work

@HardikJa You can refer to the connect clients mentioned in the documentation https://experienceleague.adobe.com/docs/experience-platform/query/clients/overview.html to access the system datasets and accordingly query the required KPI's  Query sampleshttps://experienceleague.adobe.com/docs/journey-o...

You will find it on the respective audience as follows.  When you run the following query against the profile snapshot system dataset, it will return you profiles with the respective audience membership status.select<belfiusProfileIdentifier>, segmentMembership['ups']['audienceId'].lastQualification...

You need to ingest the contact history / sending logs for the sms execution back into AEP and use the corresponding data in the audience builder to check if the profile received an SMS from the respective journey in the last 2 months

you can programmatically handle it using API's (on the customer's end) by applying necessary filters and then by pulling in the required records as needed. 

You can either download it as a csv file https://experienceleague.adobe.com/docs/journey-optimizer/using/configuration/monitor-reputation/manage-suppression-list.html?lang=en#download-suppression-list or leverage API to access the suppressed records https://developer.adobe.com/journey-optimizer-apis...

These are appended during runtime, you will have to set the type of link as external opt out / unsubscription