[bug report] After reopening Sketch global palettes resets to basic
**My steps:**
1. Clear palettes > Global (all marks).
2. Load palettes > from file in Dropbox, applied to Global (all marks).
3. Works fine.
…
4. Close Sketch, open again.
5. All Global palettes are the same as before 1st step.

Repeats every time. Any ideas? Thanks in advance!

Sketch 48.2, Mac OS Sierra 10.12.6.