magento 2.3 Design Configuration > Global page keep loading

[andy17612]

Preconditions (*)

1. magento 2.3.0
2. php 71
3. mysql 5.7

Steps to reproduce (*)

1. Open Admin Panel.
2. Chose "Content"
3. Chose "Design" ==> "Configuration"
4. After Design Configuration page loaded, then choose "Global" and click "Edit"

Expected result (*)

1. Ussually on Global Design Configuration, we can upload Logo, email logo, and icon for homepage.

Actual result (*)

1. It is freeze nothing happened. Only loading never ending. Even you refresh the page cannot succesfully loaded to show you some dialog for header, email or icon logo. Like this screenshot.
2. same with Magento 2.3 Unable to Open Admin Panel for Design Configuration to Upload Logo #19486 but i think is not theme issue.
3. Main Website and Main Website Store are working, just Global are not working

This is Global page message. please help, thank you!

file-uploader.min.js:1 Uncaught ReferenceError: Base64 is not defined
    at UiClass.processFile (file-uploader.min.js:1)
    at Array.map (<anonymous>)
    at UiClass.setInitialValue (file-uploader.min.js:1)
    at UiClass.initialize (abstract.min.js:1)
    at UiClass.initialize (wrapper.min.js:3)
    at new UiClass (class.min.js:3)
    at Object.initComponent (layout.min.js:8)
    at fire (jquery.min.js:212)
    at Object.fireWith [as resolveWith] (jquery.min.js:218)
    at Object.deferred.(/index.php/admin/theme/design_config/edit/scope/default/key/3d098cdba6b78b5b34afeb20d3e1f3d052972a2b3b29bc3d63761/anonymous function) (http://www.domain.com/pub/static/version154399332/adminhtml/Magento/backend/en_US/jquery.min.js:220:56)

[magento-engcom-team]

Hi @andy17612. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me $VERSION instance

where $VERSION is version tags (starting from 2.2.0+) or develop branches (for example: 2.3-develop).
For more details, please, review the Magento Contributor Assistant documentation.

@andy17612 do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[andy17612]

@magento-engcom-team from 2.2.6 upgrade to 2.3 after getting this problem, is not a new 2.3.

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[andy17612]

@magento-engcom-team Main Website and Main Website Store are working, just Global are not working

Hi @andy17612 thank you for you report, this issue has already fixed in 2.3-develop branch and will be available on 2.3.1 release.

[jurpro]

@engcom-backlog-nazar how to fix? we need change logo from developer theme logo to my own logo. Meanwhile, my web still use dev logo. Is there any change file? Where I will find the fix?

@andy17612 #18851

[boostify-pro]

Having same problem here, any solution please

[andy17612]

@socix file in there,but i'm testing too #18851 c96b8af#diff-5a423cde3ac7f2aed85a0994b5597827L54

[andy17612]

@engcom-backlog-nazar #18851 c96b8af#diff-5a423cde3ac7f2aed85a0994b5597827L54 I tried this file but when you Transactional email >upload logo > not showing.

[laquo]

Same problem here. Tried c96b8af#diff-5a423cde3ac7f2aed85a0994b5597827L54
After that i've also tried to select logo from gallery. It appears in the uploader block, but anyway cause an error "header_logo_src does not contain field 'file'" after i tried to save it