Thumbnail image: Recommended size 1200×627 (Aspect ratio must be 1.91:1) - jpg, png etc...
Brand logo: 1:1 ratio (min 100x100)
Long headline: 50 character max (use long description)
Short headline: 25 character max - required field, though it won't display on Sharethrough inventory
Long body text:
140 character description (use long body text)
Short body text: 90 character description - required field, though it won't display on Sharethrough inventory
---- Important note about headlines. DBM will serve either the long or short headline depending on the publisher placement character size. As all placements on Sharethrough's inventory are designed to host up to 90 characters, the long headline will always be served, that's why we recommend to always use a the Long headline. However DBM requires a short headline to save the creative. ----
Field not supported by Sharethrough:
Square image : Not supported by Sharethrough. (Optional)
If you upload a square image, DBM will generate a separate creative appending "_square" to the creative using the square image, and "_rectangle" to the creative using the rectangular image. DO NOT Assign thie _square creative to Sharethrough line items.
Call to action : Not supported by Sharethrough. (Required in the DBM UI)
Note that you'll need to populate the CTA field as DBM requires it in order for the ad to run, but the actual placement will not have it upon render.
Additional information may be found on the DBM site here.