I want to ask if there is a maximum length/size of the data stored in preferences library, i want to save some things in there, i succesfully saved short String (in my case wifi SSID and PASSWORD), but i wanted to save some other authentification credentials, for example some tokens of firebase that are pretty long (for example: fMyxcL2tQh6D7wkVW9d6vC:APA91bEK4SOoCgyWFr85pM7w-UHJ6ZU-IIgJFhUiVhsjiJg3KOtZgMtEdv7jqxXpcfhO-x3N_PeOIcpGlmj5tTnATnHXbU87bAYp2aqLHpxq1M48KRwPbKigyuJVIcusLgqH-F2BdCC4), so how can i store that kind of data? (my last option is to save that directly in the server, but i really want to have them stored locally )
https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/storage/nvs_flash.html
String values are currently limited to 4000 bytes. This includes the null terminator. Blob values are limited to 508,000 bytes or 97.6% of the partition size - 4000 bytes, whichever is lower.
Yeah! was my fault, the problem wasn't the string, was the key! i put a key with 17 characters and just 15 are allowed in preferences. Thanks for the clarification 
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