In Path of Exile (PoE), stash space and its expansions often come up as topics of interest within the community, especially since managing inventory can be a significant aspect of the gameplay. The Allflame, a quest item from the "The Ship Graveyard" quest, is typically not storable in the stash, but your reference to "All Flame stash" might be a typo or misunderstanding, perhaps referring to the overall stash space or special stashes like the ones for currency, maps, or other specific types of items.
Grinding Gear Games (GGG) periodically updates and introduces new stash tabs and increases to stash capabilities, usually aligned with new leagues or major updates to improve quality of life for players. These updates might include:
New Specialized Stash Tabs: These are often introduced to help players organize specific types of new content introduced by expansions or leagues, such as Delirium orbs, Blight oils, or Metamorph samples.
Improvements to Existing Tabs: GGG sometimes updates existing tabs to hold more items or accommodate new item types relevant to game updates.
Sales and Bundles: Occasionally, GGG offers stash tabs as part of sales or bundles, which can be an opportunity to expand your stash space at a reduced cost.
Community Feedback: GGG is known for its responsiveness to community feedback. If there is a significant demand for more stash space or improved functionality, it’s likely something they might consider for future updates.
To find out when and if stash space will be increased or improved, keeping an eye on official communications such as the Path of Exile website, forums, Reddit, and community announcements around the time new leagues are introduced is recommended. This is when most changes, including QoL improvements like stash expansions, are likely to occur.