for "Save/Projections", need to add an index into each file name.

[sichendart]

"Ga_0000_bnp_fly0254.h5.tiff" instead of "Ga_bnp_fly0254.h5.tiff" to order the files according their rotation angles.

[FabricioSMarin]

I added an index to each filename. Let me know if this works or if leading zeros are needed as well.

[decarlof]

I suggest to remove the double extension from the file name (.h5.tiff). Many standard os and python tools rely on the "." to separate file head and tail.
Would Ga_0000_bnp_fly0254.tiff work?

[sichendart]

Yes, (.tiff) will work.