It is difficult to see what goes wrong just based on the screenshots. But if Katalon works, then we should be able to solve it quickly. => If you can create a test account for us, that would be helpful. You can email the credentials to team AT ui.vision - just mention this forum post.
I did a quick test on the public tinyMCE demo, and all works fine there:
{
"Name": "tinymce",
"CreationDate": "2021-4-20",
"Commands": [
{
"Command": "open",
"Target": "https://www.tiny.cloud/docs/demo/basic-example/",
"Value": ""
},
{
"Command": "selectFrame",
"Target": "id=basic-example_ifr",
"Value": ""
},
{
"Command": "editContent",
"Target": "id=tinymce",
"Value": "<p style=\"text-align: center;\" data-mce-style=\"text-align: center;\">it works!<img title=\"TinyMCE Logo\" src=\"//www.tiny.cloud/images/glyph-tinymce@2x.png\" alt=\"TinyMCE Logo\" width=\"110\" height=\"97\" data-mce-src=\"../../../images/glyph-tinymce@2x.png\"></p><h2 style=\"text-align: center;\" data-mce-style=\"text-align: center;\">Welcome to the TinyMCE editor demo!</h2><h2>Got questions or need help?</h2><ul><li>Our <a href=\"https://www.tiny.cloud/docs/\" data-mce-href=\"../../\">documentation</a> is a great resource for learning how to configure TinyMCE.</li><li>Have a specific question? Try the <a href=\"https://stackoverflow.com/questions/tagged/tinymce\" target=\"_blank\" rel=\"noopener\" data-mce-href=\"https://stackoverflow.com/questions/tagged/tinymce\"><code>tinymce</code> tag at Stack Overflow</a>.</li><li>We also offer enterprise grade support as part of <a href=\"https://www.tiny.cloud/pricing\" data-mce-href=\"../../../pricing\">TinyMCE premium plans</a>.</li></ul><h2>A simple table to play with</h2><table style=\"border-collapse: collapse; width: 100%;\" border=\"1\" data-mce-style=\"border-collapse: collapse; width: 100%;\"><thead><tr><th>Product</th><th>Cost</th><th>Really?</th></tr></thead><tbody><tr><td>TinyMCE</td><td>Free</td><td>YES!</td></tr><tr><td>Plupload</td><td>Free</td><td>YES!</td></tr></tbody></table><h2>Found a bug?</h2><p>If you think you have found a bug please create an issue on the <a href=\"https://github.com/tinymce/tinymce/issues\" data-mce-href=\"https://github.com/tinymce/tinymce/issues\">GitHub repo</a> to report it to the developers.</p><h2>Finally ...</h2><p>Don't forget to check out our other product <a href=\"http://www.plupload.com\" target=\"_blank\" rel=\"noopener\" data-mce-href=\"http://www.plupload.com\">Plupload</a>, your ultimate upload solution featuring HTML5 upload support.</p><p>Thanks for supporting TinyMCE! We hope it helps you and your users create great content.<br>All the best from the TinyMCE team.</p>"
}
]
}