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Hi Helene UC. I checked the file you shared via private message. If the missing annotations you mentioned are the gray rectangles on the right side, then unfortunately, this is irreversible.
As the MVP Stefan Blom **** mentioned, some format conversions may cause these contents to be unsupported in the new format, resulting in their deletion or transformation into other styles.
Although I would very much like to provide further assistance, the fact is that you may need to consider recreating such a document and avoid format conversions or content transfers that could lead to format errors or compatibility issues in future work. Keeping a backup copy is highly recommended.
Thank you for your understanding and support. If you encounter any other issues while using Microsoft products, feel free to continue posting in the community. We are always here to help!
Best Regards Eliac | Microsoft Community Support Specialist