⏳ Error when importing JSON directly in Editor (4.0.x) – works in backend and with 3.35.9

[gx1-hub]

Description

When trying to import a .json template directly in the Elementor Editor (via the folder icon), I receive the following error:
Error occurred, this source does not support import
Important details:

Importing the same JSON file via Elementor → Templates → Import Templates (backend) works without any problem.
When trying to import a .json template directly in the Elementor Editor (via the folder icon), the following error appears:
Error occurred, this source does not support import

Key points:

Importing the same JSON file via Elementor → Templates → Import Templates (in the dashboard) works perfectly.
The problem only occurs with the direct import inside the Editor.
Updating to Elementor Core 4.0.1 introduced the issue.
Rolling back to Elementor Core 3.35.9 (keeping Elementor Pro 4.0.1) completely resolves the problem.

Environment:

WordPress 6.9.4 (Multisite)
Elementor Core: 4.0.1 (broken) → 3.35.9 (working)
Elementor Pro: 4.0.1
Theme: Hello Elementor
PHP: 8.4.19

Additional notes:
The issue appears on multiple sites in the network. Clearing cache, Safe Mode, and deactivating all other plugins did not help.

Steps to reproduce

1. Use Elementor Core 4.0.1 + Pro 4.0.1
2. Open any page with the Elementor Editor
3. Click the folder icon → Import Template → select a .json file
4. After confirming the unsafe JSON warning, the error occurs.

Expected behavior

The template should import successfully directly in the editor.

Elementor System Info

Click to reveal

== Server Environment ==
	Operating System: Linux
	Software: Apache
	MySQL version: Debian 12 v10.11.6-MariaDB-0+deb12u1
	PHP Version: 8.4.19
	PHP Memory Limit: 1024M
	PHP Max Input Vars: 1000
	PHP Max Post Size: 16M
	GD Installed: Yes
	ZIP Installed: Yes
	Write Permissions: All right
	Elementor Library: Connected

== WordPress Environment ==
	Version: 6.9.4
	Site URL: https://kk-talents.com/in
	Home URL: https://kk-talents.com/in
	WP Multisite: Yes
	Max Upload Size: 16 MB
	Memory limit: 1024M
	Max Memory limit: 1024M
	Permalink Structure: /%postname%/
	Language: en_US
	Timezone: Europe/Berlin
	Debug Mode: Inactive

== Theme ==
	Name: Hello Elementor
	Version: 3.4.7
	Author: Elementor Team
	Child Theme: No

== User ==
	Role: administrator
	WP Profile lang: en-US
	User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36

== Active Plugins ==
	FluentCRM - Marketing Automation For WordPress
		Version: 2.9.87
		Author: WP Email Newsletter Team - FluentCRM

	FluentCRM Pro
		Version: 2.9.86
		Author: Fluent CRM


== Network Plugins ==
	Advanced Custom Fields
		Version: 6.8.0
		Author: WP Engine

	Advanced Custom Fields Multilingual
		Version: 2.2.2
		Author: OnTheGoSystems

	Code Snippets
		Version: 3.9.5
		Author: Code Snippets Pro

	Duplicator Pro
		Version: 4.5.25.2
		Author: Duplicator

	Elementor
		Version: 3.35.9
		Author: Elementor.com

	Elementor Pro
		Version: 4.0.1
		Author: Elementor.com

	FluentSMTP
		Version: 2.2.95
		Author: FluentSMTP & WPManageNinja Team

	Hreflang Manager
		Version: 1.50
		Author: DAEXT

	MalCare WordPress Security Plugin - Malware Scanner, Cleaner, Security Firewall
		Version: 6.39
		Author: MalCare Security

	NS Cloner - Site Copier
		Version: 4.4.9.1
		Author: Never Settle

	PhastPress
		Version: 3.9
		Author: Albert Peschar

	Slim SEO
		Version: 4.9.4
		Author: Slim SEO

	Wordfence Security
		Version: 8.1.4
		Author: Wordfence

	WP-Sweep
		Version: 1.1.8
		Author: Lester 'GaMerZ' Chan

	WP Fastest Cache
		Version: 1.4.6
		Author: Emre Vona

	WP Meteor
		Version: 3.4.17
		Author: Aleksandr Guidrevitch

	WPML Media Translation
		Version: 3.1.0
		Author: OnTheGoSystems

	WPML Multilingual CMS
		Version: 4.9.2
		Author: OnTheGoSystems

	WPML String Translation
		Version: 3.5.1
		Author: OnTheGoSystems


== Must-Use Plugins ==
	Force Hello Elementor Network-wide
		Version: 1.0
		Author: 


== Features ==
	Custom Fonts: 1
	Custom Icons: 0

== Integrations ==
	


== Elementor Experiments ==
	Inline Font Icons: Active
	Additional Custom Breakpoints: Inactive
	Container: Active
	Optimized Markup: Active
	Default to New Theme Builder: Inactive
	Header & Footer: Inactive
	Pro Free Trial Popup: Active by default
	Nested Elements: Active
	Pages Panel: Inactive by default
	Elementor Home Screen: Active by default
	Atomic Widgets: Inactive by default
	Global Classes: Inactive by default
	Enforce global classes capabilities: Active by default
	Variables: Active by default
	Cloud Library: Active
	Editor v4 (Opt In Page): Active by default
	Editor V4: Inactive by default
	Components: Active by default
	Interactions: Active by default
	Editor one: Active by default
	Import/Export Customization: Active by default
	Elementor Editor Events: Active by default
	Atomic Form: Active by default
	Menu: Inactive
	Size Variables: Active by default
	Pro Interactions: Active by default
	In-Editor Feedback: Inactive by default


== Log ==
	


== Elementor - Compatibility Tag ==
	


== Elementor Pro - Compatibility Tag ==
	

Agreement

• I confirm I have read and followed all the guidelines and instructions outlined in the Elementor Bug Report form.
• I agree that my issue may be closed without further action if it doesn't meet all the requirements outlined in the Elementor Bug Report form.

[wantmyusername]

same here, clean installation

[nicholaszein]

Hello.

Please clarify if the template file was generated by Elementor or by an external tool.

If it was generated by Elementor, please clarify if the origin and destination sites have the same addons and extensions installed, and have the same features enabled.

[gx1-hub]

Yes, it was generated by elementor and destination sites have the same addons and extensions installed, and have the same features enabled.

[losvincent]

Hello, I'm running into the same issue.Seems cache issue with elementor,after refrech cache and cdn cache 3 times,imported successful