What's the story behind the portrait of Sai Baba that Kakasaheb Dixit saw before his trip to Shirdi?

The portrait of Sai Baba that Kakasaheb Dixit encountered had a notable history. According to Chapter 51, this was the same photograph that Megha, a devoted disciple, used to worship with great love, viewing it as Lord Shankar. The glass on the portrait had broken, so it was sent from Shirdi with Balasaheb to Nagar for repairs. After being repaired, the portrait was kept covered in Mirikar's drawing room. Balasaheb unveiled it for Dixit and entrusted it to Madhavrao, suggesting they travel to Shirdi in Baba's company. Dixit was overwhelmed with joy upon seeing the image of the one whose darshan he longed for.