Vajrasar Goswami

@chuffeddeal

Please explain the issue you are facing and also what you want to achieve.

Also, please share the URL where we can see the issue.

Thanks.

Ah, great. Thanks for posting back with the reasons for the issue and how it got resolved. It would help someone with the same thing. Cheers!

Yes, for the same, you need to incorporate Custom Metaboxes. Please go through the resources I shared in the previous reply.

Do you get asked for FTP details when you try to upload media/install plugins?

If so, read this — https://stackoverflow.com/questions/640409/can-i-install-update-wordpress-plugins-without-providing-ftp-access

Did you make a new db while installing the new WP? If not, do it that way.

1. Create a new db.
2. Empty your root (/public_html)
3. Unzip new WP zip in root
4. Run the install
5. Provide new db credentials during install
6. Then check

Can you set WP_DEBUG to TRUE in wp-config.php and then check if any Warnings or Error pops up while using the customizer?

You can always upload your documents via Media Upload function inside the WordPress Dashboard and then use the URL provided to link the document (that would be your file’s path).

Check this tutorial for reference — https://www.wpbeginner.com/beginners-guide/how-to-upload-pdf-files-to-your-wordpress-site/

Just taking a guess here but I believe the issue is maybe related to something (some link) in your content.

Do you have any images in the content, that while you copy and paste carry forward to the live website?

I’d suggest you copy the content and then paste in the live website using Paste as Plain Text option in the editor. Check the Tip:13 in the following article.

https://www.wpbeginner.com/beginners-guide/14-tips-for-mastering-the-wordpress-visual-editor/

First, deactivate all the plugins one-by-one while checking if the problem still persists.

Second, change the default theme to other WordPress theme and check if the customizer works in that theme. Then change back to the theme you want and check again.

PS: Before anything, if the website has any data, take a backup first.

You need to read and understand the use of Custom Field, Custom Metaboxes and then about How to use them in a Custom Template.

Good starting points –

https://codex.www.ads-software.com/Custom_Fields
https://www.wpbeginner.com/wp-tutorials/wordpress-custom-fields-101-tips-tricks-and-hacks/
https://torquemag.io/2016/04/use-advanced-custom-fields-depth-tutorial/

you can upload on a free image hosting site like imgur.com and share the link here or maybe upload on your google drive/dropbox and share the link.

Some good points to address this issue is listed in the article linked below:

https://premium.wpmudev.org/blog/fix-not-allowed-access-page-error-wordpress/

You can start with enabling WP_DEBUG to true in wp-config.php and also check error logs for anything unusual.

An extensive troubleshooting guide – https://perishablepress.com/how-to-troubleshoot-wordpress/

Can you provide the screenshot of what you see when you access the customizer option? This would help analyzing if something is missing.

At this point I’d suggest you seek the expertise of a developer or can opt for WordFence’s paid cleaup plan.

The files I see are mostly malicious by inserting malicious code in the theme/plugin files and few files are additional (maybe inserted whilst the malicious attempt).

Once the cleanup is processed, you can harden your WordPress security by follwing this guide – https://codex.www.ads-software.com/Hardening_WordPress

Additionally you can also install Sucuri WordPress Plugin and use that to harden the security measures.

@danielgm Yes, that is right but my intention with suggesting is_singular is to check if the template is single template and the post type is the CPT. Anyways, I understand you are after something else.

Please look at the @jakept ‘s revert