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Individual parts still exist after boolean union operation

Hello,
I have applied Surface text to this sphere and the letters are treated as single parts.
If I apply a boolean union operation to them, they are still not combined into 1 part but remain as individual parts, regardless of whether I check the Keep tools box or not.
Why is this the case?
Salve
ProApe
https://cad.onshape.com/documents/e35bb858a4c18af395dd5ad9/w/75bce84b5635727a89424986/e/6cf87354626002ff3eead80c?renderMode=0&uiState=6836c6cf77f58a39ea38fbb4
Answers
This usually happens if there is no clear overlap between the volumes, e.g. when they almost share one face, edge or such. In your case, it is the sphere surface. Try offsetting the common face, so the algorithm can clearly 'see' what is inside and what is outside the resulting part.
In your case, though, you don't need no boolean. Just use the "add" option of the text on surface FS:
https://cad.onshape.com/documents/5306ada221aca0e45359f22f/w/fb0ce473cb328dd6f2d8aa42/e/0a35215ec20b1f1b67f0bd76?renderMode=0&uiState=6836dae061410414e643bd75
Ok, thank you!
I drew from a tutorial where connctors were inserted in the assembly to make the sphere rotate; I couldn't get that to work. I inserted a connector in the center of the sphere and one on the empty space in the assembly, but they won't come together.
I had also imagined either leaving the sphere stationary and only rotating the text, or rotating the sphere in the other direction, but I don't know how to proceed; the prerequisite is that the text forms its own part.