The Prophet ﷺ said, "There is no Muslim who sends blessings upon me except that the angels send blessings upon him as long as he sends blessings upon me. So let the servant do this little or much."
حدثنا بكر بن خلف أبو بشر حدثنا خالد بن الحارث عن شعبة عن عاصم بن عبيد الله قال سمعت
عن النبي ﷺ قال ما من مسلم يصلي علي إلا صلت عليه الملائكة ما صلى علي فليقل العبد من ذلك أو ليكثر
[Its chain of transmission is daif]Asim is daif as stated in Taqrib and others, and the majority declared him daif (Majma al-Zawaid, 8/150), and Busiri said, "This chain is daif," and it has corroborating narrations in Ishaq al-Qadi's Fi al-Salat ala al-Nabi, hadith no. 3, and others.