A text story image starts as a design problem. The words need enough space, a clear hierarchy, and a background that lets them be read quickly. This page can prepare the finished artwork, but it cannot add a headline, choose a font, fix a spelling mistake, or move a line away from a busy part of the background.
The starting export is our 1080×1920 vertical PNG with sharpening off. It is a practical story-shaped canvas, not a claim about every Snapchat upload requirement. Create the source in the same general shape so the final crop does not remove part of a sentence. A square quote card often needs a new layout rather than a taller resize.
Keep essential wording away from the extreme edges of the design, where interface elements may compete with it. Do not try to fit a full announcement page into one screen. Shorter wording and a readable type size help more than a technically large file full of text that needs zooming.