Hi Elena
I hope you're doing well today!
I'm sending this message for a quick recap of our phone call regarding your concern on ad copy not showing up & unable to edit the ad copy.
I recommended to try other browser then as we switch from Firefox to Google Chrome the issue was resolved.
Browser compatibility can be the cause of this issue and as a workaround we recommend login in using a private/incognito window or trying different browsers like Microsoft Edge or Google Chrome.
Should you have questions or if you wish to discuss this further, please feel free to reply to this email and I will be happy to assist you. You may also contact us at 1-800-518-5689 (06:00 – 18:00 PST Monday – Friday and 08:00 – 18:00 PST Friday) or via chat (open 24 hours a day, 7 days a week), for immediate assistance.
We value you and your business. Your success is our success as well. Thank you for contacting Microsoft Advertising. Enjoy the rest of the day.
Thank you,
John Mark| Microsoft Advertising Support Specialist | 800-518-5689