Possible issues with large(ish) files [Resolved]

I am having a few issues with large files

1. "My files" tab seems to crash if it tries to show all the segments with an error like follows:

   <BLE> Unable to decode "[\".boot0\",\".bootcde\",\"%2Bboot\",\"­%2Bsetting\",\"-setting\",\"%40setting\"­,\"*setting\",\"%2Babout\",\"-about\",\"­*about\",\"%2Bsbt\",\"%3Dsbt\",\"%2Bsbat­\",\"%3Dsbat\",\"%2Bfitclck\",\"-fitclck­\",\"*fitclck\",\"ftclog%01\",\"ftclog%0­2\",\"ftclog%03\",\"ftclog%04\",\"ftclog­%05\",\"ftclog%06\",\"ftclog%07\",\"ftcl­og%08\",\"ftclog%09\",\"ftclog%0A\",\"ft­clog%0B\",\"ftclog%0C\",\"ftclog%0D\",\"­ftclog%0E\",\"ftclog%0F\",\"ftclog%10\",­\"ftclog%11\",\"ftclog%12\",\"ftclog%13\­",\"ftclog%14\",\"ftclog%15\",\"ftclog%1­6\",\"ftclog%17\",\"ftclog%18\",\"ftclog­%19\",\"ftclog%1A\",\"ftclog%1B\",\"ftcl­og%1C\",\"ftclog%1D\",\"ftclog%1E\",\"ft­clog%1F\",\"ftclog%20\",\"ftclog!\",\"ft­clog%22\",\"ftclog%23\",\"ftclog%24\",\"­ftclog%25\",\"ftclog%26\",\"ftclog'\",\"­ftclog(\",\"ftclog)\",\"ftclog*\",\"ftcl­og%2B\",\"ftclog%2C\",\"ftclog-\",\"ftcl­og.\",\"ftclog%2F\",\"ftclog0\",\"ftclog­1\",\"ftclog2\",\"ftclog3\",\"ftclog4\",­\"ftclog5\",\"ftclog6\",\"ftclog7\",\"ft­clog8\",\"ftclog9\",\"ftclog%3A\",\"ftcl­og%3B\",\"ftclog%3C\",\"ftclog%3D\",\"ft­clog%3E\",\"ftclog%3F\",\"ftclog%40\",\"­ftclogA\",\"ftclogB\",\"ftclogC\",\"ftcl­ogD\",\"ftclogE\",\"ftclogF\",\"ftclogG\­",\"ftclogH\",\"ftclogI\",\"ftclogJ\",\"­ftclogK\",\"ftclogL\",\"ftclogM\",\"ftcl­ogN\",\"ftclogO\",\"ftclogP\",\"ftclogQ\­",\"ftclogR\",\"ftclogS\",\"ftclogT\",\"­ftclogU\",\"ftclogV\",\"ftclogW\",\"ftcl­ogX\",\"ftclogY\",\"ftclogZ\",\"ftclog%5­B\",\"ftclog%5C\",\"ftclog%5D\",\"ftclog­%5E\",\"ftclog_\",\"ftclog%60\",\"ftclog­a\",\"ftclogb\",\"ftclogc\",\"ftclogd\",­\"ftcloge\",\"ftclogf\",\"ftclogg\",\"ft­clogh\",\"ftclogi\",\"ftclogj\",\"ftclog­k\",\"ftclogl\",\"ftclogm\",\"ftclogn\",­\"ftclogo\",\"ftclogp\",\"ftclogq\",\"ft­clogr\",\"ftclogs\",\"ftclogt\",\"ftclog­u\",\"ftclogv\",\"ftclogw\",\"ftclogx\",­\"ftclogy\",\"ftclogz\",\"ftclog%7B\",\"­ftclog%7C\",\"ftclog%7D\",\"ftclog~\",\"­ftclog%7F\",\"ftclog%80\",\"ftclog%81\",­\"ftclog%82\",\"ftclog%83\",\"ftclog%84\­",\"ftclog%85\",\"ftclog%86\",\"ftclog%8­7\",\"ftclog%88\",\"ftclog%89\",\"ftclog­%8A\",\"ftclog%8B\",\"ftclog%8C\",\"ftcl­og%8D\",\"ftclog%8E\",\"ftclog%8F\",\"ft­clog%90\",\"ftclog%91\",\"ftclog%92\",\"­ftclog%93\",\"ftclog%94\",\"ftclog%95\",­\"ftclog%96\",\"ftclog%97\",\"ftclog%98\­",\"ftclog%99\",\"ftclog%9A\",\"ftclog%9­B\",\"ftclog%9C\",\"ftclog%9D\",\"ftclog­%9E\",\"ftclog%9F\",\"ftclog%A0\",\"ftcl­og%A1\",\"ftclog%A2\",\"ftclog%A3\",\"ft­clog%A4\",\"ftclog%A5\",\"ftclog%A6\",\"­ftclog%A7\",\"ftclog%A8\",\"ftclog%A9\",­\"ftclog%AA\",\"ftclog%AB\",\"ftclog%AC\­",\"ftclog%AD\",\"ftclog%AE\",\"ftclog%A­F\",\"ftclog%B0\",\"ftclog%B1\",\"ftclog­%B2\",\"ftclog%B3\",\"ftclog%B4\",\"ftcl­og%B5\",\"ftclog%B6\",\"ftclog%B7\",\"ft­clog%B8\",\"ftclog%B9\",\"ftclog%BA\",\"­ftclog%BB\",\"ftclog%BC\",\"ftclog%BD\",­\"ftclog%BE\",\"ftclog%BF\",\"ftclog%C0\­",\"ftclog%C1\",\"ftclog%C2\",\"ftclog%C­3\",\"ftclog%C4\",\"ftclog%C5\",\"ftclog­%C6\",\"ftclog%C7\",\"ftclog%C8\",\"ftcl­og%C9\",\"ftclog%CA\",\"ftclog%CB\",\"ft­clog%CC\",\"ftclog%CD\",\"ftclog%CE\",\"­ftclog%CF\",\"ftclog%D0\",\"ftclog%D1\",­\"ftclog%D2\",\"ftclog%D3\",\"ftclog%D4\­",\"ftclog%D5\",\"ftclog%D6\",\"ftclog%D­7\",\"ftclog%D8\",\"ftclog%D9\",\"ftclog­%DA\",\"ftclog%DB\",\"ftclog%DC\",\"ftcl­og%DD\",\"ftclog%DE\",\"ftclog%DF\",\"ft­clog%E0\",\"ftclog%E1\",\"ftclog%E2\",\"­ftclog%E3\",\"ftclog%E4\",\"ftclog%E5\",­\"ftclog%E6\",\"ftclog%E7\",\"ftclog%E8\­",\"ftclog%E9\",\"ftclog%EA\",\"ftclog%E­B\",\"ftclog%EC\",\"ftclog%ED\",\"ftclog­%EE\",\"ftclog%EF\",\"ftclog%F0\",\"ftcl­og%F1\",\"ftclog%F2\",\"ftclog%F3\",\"ft­clog%F4\",\"ftclog%F5\",\"ftclog%F6\",\"­ftclog%F7\",\"ftclog%F8\"]\r", got URIError: URI malformed
   

2. The above file ftclog is actually less than an Mb. But Bangle stops writing to it after a certain point and throws 'file too big' error. Question is, how big a file can I write? Should it be 4Mb-Firmware size? Is that transparent if I use StorageFile or are there some tricks I am missing.

Update : Removed 3rd point which is unrelated to large files.