Having a Syncthing folder destination on an external drive in Android can be a lot of work.
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In base conditions, most Android devices only really support write permissions for exFat/FAT32. NTFS has read permissions but not write permissions. This results in common file corruption for things such as car dashboards whenever the car is turned off while synching.
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The common file corruption makes “local changes” common.
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It also makes scanning take longer since the system needs to reverify stuff.