Adding Frame, Script tags to TinyMCE editor
By default, Joomla will restrict you from inserting high-risk code such as IFRAME, JAVASCRIPT, STYLE into articles for security reasons.
However, it also causes trouble when you try to insert something from a third party that you trust. Such as Maps, Youtube or Charts...
This article will show you how to insert advanced codes into articles without losing them when saving. Please make sure you know what codes you are going to add.
1. First, you need to grant permissions to the user group that can use these tags.
At the admin page, go to System > Global Configuration > Text Filtering, select the user group. If you are an administrator, the group will be Super User. Select Filter Type as No Filtering.

2. Go to Extensions > Plugins > Editor - TinyMCE > Set Use Joomla Text Filter is Yes.

3. Go to the article to add code, click Toogle Editor button. Then paste the code to add and save the article.

In case you are using another editor, you should contact their developer to resolve it. Alternatively, you can also use the Custom HTML module to insert these codes.
I migrated about a thousand items with attachments from K2 using your tool and attachments plugin. I initially did this on a test account. Everything worked fine over there. The migrated article attachments worked fine. Then I backed it all up and moved it to my live domain. Now none of the attachments load. All I get is Exception File Not Found and I can't figure out where to look. Turning on error reporting and debug don't tell me anything. I am guessing the old files were not moved during the migration correct? Or how does that all work? I still have all the original folders in the original places as far as I can tell.
An error has occurred. 0 implode(): Argument #2 ($array) must be of type ?array, string given
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Any idea what's causing this?