Scripts are normally Substy's primary selling path. Solo Bundles give Substy another eligible PPV option when a direct content bundle is a better fit for a fan.
Substy can consider Solo Bundles when:
normal Script offers have not converted for that fan;
no suitable Script is available for the fan;
the fan directly asks for a type of content that matches an eligible Solo Bundle.
Scripts still stay primary when they are the best available fit. Solo Bundles do not replace Scripts globally, and they are not sent randomly.
For the normal paid Solo Bundle path, a bundle should:

be Enabled;
contain media;
not be marked Giftable;
have enough media context or tags for Substy to match it;
not already have been bought by that fan;
avoid repeating media the fan already received when possible.
If no eligible Solo Bundle is available, Substy can continue with an eligible Script instead.
When a fan clearly asks for a type of content and an eligible Solo Bundle matches that request, Substy can prioritize matching content. If there is no suitable match, Substy should not force unrelated content into that request.
The exact offer can still depend on availability, fan preferences, prior purchases, and the current conversation state.
Giftable bundles are not part of the normal paid Solo Bundle ladder. Use Giftable when the bundle should be available as a free gift or deal sweetener rather than as a standard paid PPV offer.