UEFN Build Fails - Snapshot Storage Error

General Issues and Bug Reporting
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1

Summary

my UEFN project is completely unable to publish any versions. Even when reverting to previously published snapshots, I get the error:

LogValkyrie: Error: Failed to store project snaphsot with error:
LogValkyrie: Error: Create build failed: Failed to store project snapshot

This occurs:

  • Across multiple accounts
  • On multiple PCs
  • Even on old published project versions

Im already at Snapshot 1224. I dont know if its possible that that has anything to do with it but I really cant find any ways to fix it.

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Publishing

Steps to Reproduce

Launch Memory Calculation or Upload to Private Versions.
But like I said maybe also having 12224 Snapshots.

Expected Result

Launching Memory Calculation or Uploading to Private Versions

Observed Result

Getting the Error:
LogValkyrie: Error: Failed to store project snaphsot with error:
LogValkyrie: Error: Create build failed: Failed to store project snapshot

Platform(s)

PC

Island Code

8354-4938-9805

Upload an image

Screenshot 2025-07-18 011524.png

Screenshot 2025-07-18 010438.png
Screenshot 2025-07-18 010438.png303×196 47.5 KB

2

When Fortnite is closed, private version upload works. When Fortnite is launched and connected to UEFN, the same upload fails with Failed to store snapshot . Nothing works even after deleting Saved and Interemediate folders.
Please Help!

1 Like
3

Another summary because nobody seems to have a clue but I keep trying.

The error occurs only when Fortnite is running in-session (e.g. for memory calculation with FN open).

Private version uploads succeed when Fortnite is not open.

The issue persists across two different PCs, with clean environments and cleared local Saved and Intermediate folders.

Revision Control has been toggled off/on without resolution.

I also tried reverting to old snapshots (even previously published ones), but the same error still occurs.

1 Like
4

IM FACING THE SAME ISSUE

1 Like
5

How many Snapshots do you have on your Map?
Im guessing also a lot?

6

Also facing some issue when trying to create a module version: “UEFN failed to validate candidate module versions”

7

Someone got it on a Map with just 50 Snapshots so thats probably not the Issue as I thought before

8

also having this issue